Choosing a Subsite beacon isn’t a brand decision. It’s a jobsite decision. Your tracker must read the beacon. The beacon must reach the depth you actually drill. And the signal has to hold up when the jobsite is full of interference.

Subsite and Ditch Witch publish the facts you need to choose well: compatibility, frequency options, depth range, power settings, battery behavior, temperature limits, housing guidance, and ownership details. Use those facts, and you’ll stop guessing.

Start with tracker and beacon compatibility

Start with one question: Will your tracker work with the beacon you’re about to buy? If you run the TK RECON system, the operator’s manual gives you the compatibility baseline: TK RECON trackers are compatible with TX, 86B, and 88B Series beacons, and it adds: “for best performance, use T Series beacons.”

That line matters because “compatible” isn’t the same as “best.” The same manual explains that interference can disrupt guidance and that one way to minimize interference is to use system features such as changing beacon frequencies. If your workflow depends on changing frequencies to keep tracking clean, you need a beacon line that supports that approach.

Subsite’s HDD beacons literature lays out what the T Series gives you: multi-frequency options and specifications by model, including depth ranges and operational details. Subsite’s TK Series literature also emphasizes the system’s ability to work with multiple frequencies in a single beacon.

For a reference list of Ditch Witch Subsite beacons/transmitters (including models like 86B, 88B, and 17T1) and the locating systems they’re intended to work with, see this page.

Buying rule: confirm the tracker you run, then choose a beacon family that fits that tracker and the way you locate in the field.

Choose frequency based on interference, not preference

Frequency is a tool. Use it. The TK RECON manual breaks interference into two types—active and passive—and both can disrupt guidance if you ignore them.

Here’s the most useful line in the manual for beacon selection: “Setting beacon to a lower frequency typically lessens the effect of passive interference.” That single sentence tells you why “one-frequency fits all” fails on many jobs. When passive interference is high, a lower frequency can help.

Subsite backs that up with a concrete example. The HDD beacons brochure calls out low frequency capability (1.5 kHz) as enabling work around materials like metal rebar. If you drill near reinforced concrete, you don’t need a pep talk. You need options.

The same TK RECON manual also says interference effects can be minimized by using system features such as changing beacon frequencies. So frequency choice isn’t only about what you buy. It’s also about what you can change in the field when conditions change.

Active interference: when the corridor is “noisy”

Active interference comes from magnetic fields that compete with your beacon signal. The TK RECON manual lists examples contractors see every day: utilities, traffic loops, alternators, cell phones, radio towers, and cathodic protection. It warns these sources can cause the tracker to misread the beacon signal.

This is where multi-frequency capability earns its keep. The TK RECON manual points directly to using system features—such as changing beacon frequencies—to minimize interference effects. Subsite’s TK Series literature aligns with that approach and highlights up to four frequencies in a single beacon to help avoid interference.

The TK RECON manual also describes a Bore Path Analyzer that recommends frequencies to ensure better communication for accurate depth and location. Don’t treat that as a feature you might use someday. If you drill in congested corridors, you’ll need every advantage you can get.

Buying rule: if your average job is full of active interference sources, prioritize beacon options that give you multiple frequencies and support frequency changes in the field.

Passive interference: when metal distorts the beacon field

Passive interference is different. It isn’t “noise.” It’s distortion. The TK RECON manual defines passive interference as distortion of the beacon’s magnetic field that is not accounted for in tracker measurements, which can lead to calculation errors. It lists common sources: rebar, metal fences, and the drilling unit.

This is why some jobs feel inconsistent. You can get a detectable signal, but the field is distorted. The manual’s guidance is direct: lower frequency typically lessens the effect of passive interference.

Subsite’s HDD beacon brochure ties that concept to a real jobsite condition: 1.5 kHz low frequency helps work around metal rebar. If your work regularly runs near reinforced concrete, heavy fencing, or other metal, don’t treat low frequency as a bonus. Treat it as a requirement you may need to reach for when the corridor starts bending the field.

Buying rule: in high-metal environments, favor beacons and systems that let you run lower frequencies when passive interference shows up.

Match depth range and power level to your typical bores

Depth range sells beacons. Depth range also misleads buyers when they treat one number as universal. Subsite’s HDD beacons brochure gives you the right way to compare: it lists key specs by model, including depth range, battery life, max temperature, dimensions, and pitch resolution.

Use those model specs to match what you drill. Examples from the brochure’s table:

• 15T1 (29 kHz): depth range listed as 70 ft; max temperature 221°F (105°C); size 15 x 1.25 in; pitch resolution 0.1%.
• 17T4 / 17T4G (1.5, 12, 20, 29 kHz): depth ranges listed by frequency and power level, including up to 110 ft at 29 kHz depending on power level; max temperature 221°F (105°C); size 17.8 x 1.5 in.
• 19T3 (12, 20, 29 kHz): depth ranges listed up to 120 ft depending on frequency and power; max temperature 221°F (105°C); size 19 x 1.25 in; pitch resolution 0.1%.

Power level matters because it changes how the beacon performs and how long it runs. Subsite notes field-configurable power levels as a way to extend battery life, and the brochure’s spec table breaks battery life out by power levels (shown as B / H / X).

Buying rule: pick a beacon that covers your typical depth with room to spare, then plan power settings around your bore length and battery needs.

Decide what data you need: standard guidance vs. grade-critical work

A beacon isn’t just “a signal.” It transmits information you use to steer and to manage the tool downhole.

Subsite’s beacon manuals spell out what the beacon communicates. The 17T4/17T4G manual states it transmits roll angle, beacon temperature, beacon battery status, and pitch information. The 15T3/19T3 manual covers the same set of guidance data.

That matters because those readings drive decisions on the job. Battery status and temperature aren’t paperwork. They help you prevent avoidable downtime. Pitch and roll aren’t “nice to have.” They are the core of steering.

Precision matters, too. Subsite’s HDD beacons brochure lists pitch resolution in the spec table, including 0.1% on multiple T Series models. If you bid work where pitch control drives success—tight corridors, long runs, design constraints—pitch resolution belongs in your selection criteria.

And if your work is grade-critical, the TK RECON manual makes the requirement plain: the system can track critical grade bores when using a grade beacon. Don’t separate “grade work” from “beacon choice.” Treat the beacon as part of the grade package.

Don’t ignore the downhole housing: fit and setup affect performance

Beacon performance depends on the downhole setup. Subsite says that directly in its manuals.

The 17T4/17T4G manual states the beacon performs best in Subsite-approved downhole tool housings. The 15T3/19T3 manual gives the same guidance. If your housing choice is inconsistent, don’t be surprised when performance is inconsistent.

Subsite also addresses the housing factor in its HDD beacons brochure by noting automatic tuning circuitry that adjusts to match the housing the operator is using. That feature exists for a reason: the housing affects the system, and the beacon compensates.

Operational behavior matters as well, especially for battery planning. Both the 17T4/17T4G and 15T3/19T3 manuals describe beacon sleep behavior: the beacon sleeps after 20 minutes with no roll and wakes when rolled. Both manuals also describe how to set the beacon to sleep after five minutes by rolling it to 5 o’clock.

Buying rule: choose a beacon that fits your housing and your operating habits—not just your target depth and frequency.

Plan for ownership: repairability, warranty, and compliance

A beacon purchase is also an ownership decision. Subsite states that its HDD beacons are repairable and describes a replaceable electronic module that a dealer can replace to make the beacon “jobsite-ready for about half the cost of a new beacon.” If you run multiple crews, repairability changes what you keep in your inventory and how fast you can get a unit back in service.

Subsite also states a warranty term for HDD beacons: 3 years/750 hours (whichever comes first). That’s not a footnote. It’s part of total cost of ownership.

Manuals matter for repair workflow, too. The 15T3/19T3 manual includes repair and warranty handling details, including guidance on authorized repair. If you want consistent uptime, treat those procedures like part of your tool program, not like paperwork.

If you need compliance documentation, the TK RECON manual includes an FCC statement and notes the system complies with Part 15 of the FCC Rules, and it lists FCC IDs for internal transmitters and the T Series beacon module.

Quick selection checklist (use this before you buy)

Decision point	What to look for
Tracker compatibility	TK RECON compatibility with TX, 86B, 88B; “for best performance, use T Series beacons.”
Interference environment	Active interference sources include utilities, traffic loops, alternators, cell phones, radio towers, cathodic protection; passive interference sources include rebar, metal fences, drilling unit.
Frequency strategy	Lower frequency typically lessens passive interference; low frequency (1.5 kHz) supports work around rebar.
Depth range + power	Compare depth range and battery life by model; note field-configurable power levels and battery life by B/H/X power levels.
Guidance data + precision	Beacons transmit roll angle, temperature, battery status, pitch; compare pitch resolution (e.g., 0.1%).
Housing fit + setup	Use Subsite-approved housings; automatic tuning circuitry adjusts to match housing; sleep settings (20 minutes default, five minutes via 5 o’clock).
Ownership	Repairable beacons; replaceable electronic module; warranty 3 years/750 hours.