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GopherTrunk PC Build
The cheapest way into GopherTrunk is the computer already on your desk. Add an SDR dongle, an antenna, and a small adapter, and the Windows, Mac, or Linux machine you own becomes a full P25/DMR/NXDN/TETRA trunking scanner. The software is free; this whole build is about $60–80 in hardware.
Key takeaways Use a PC you own (Windows/Mac/Linux, any machine from the last ~decade). Buy: a RTL-SDR dongle (~$35), a dipole antenna kit (~$25), an SMA adapter (~$13). Cheapest route: the dongle + antenna bundle. Optional: an LNA for weak signals, a notch filter for city overload. Total ~$60–80. No build decodes encryption.
The complete parts list
| # | Item | Why | Pick | Approx $ |
|---|---|---|---|---|
| 1 | Computer | Runs GopherTrunk | A PC/laptop you already own | $0 |
| 2 | SDR dongle | Receives the radio | RTL-SDR Blog V4 or NESDR SMArt v5 | ~$35 |
| 3 | Antenna | Actually hears signals | Telescopic dipole kit | ~$25 |
| 4 | SMA adapter kit | Joins antenna to dongle | 16-piece SMA adapter kit | ~$13 |
| + | LNA (optional) | Boosts a weak, distant channel | RTL-SDR Blog wideband LNA | ~$30 |
| + | FM notch filter (optional) | Fixes broadcast overload | Broadcast FM block filter | ~$25 |
| + | Active USB extension (optional) | Antenna at the window, PC elsewhere | Shielded active cable | ~$15 |
Running total (essentials): ~$73. Buy the dongle-plus-antenna bundle and it drops toward ~$60. Add the optional parts only if your reception needs them.
The picks
RTL-SDR Blog V4 + dipole kit
around $50
The dongle and a proper tunable dipole antenna in one box — items 2 and 3 of the list together, for less than buying them apart. The simplest way to start a PC build.
V4 + antenna kit on Amazon →NooElec NESDR SMArt v5
around $35
0.5 ppm TCXO, aluminium heatsink case, R820T2/R860 tuner. The mainstream "just buy this" dongle — rock-steady control-channel lock and reliable stock. Pair with a dipole.
NESDR on Amazon →16-piece SMA adapter kit
around $13
SMA to/from BNC, UHF, N, and F in both genders. Covers almost any dongle-to-antenna connector you will hit — the one thing to buy if you are unsure what your antenna ends in.
Adapter kit on Amazon →Why these parts
The dongle is the receiver. A good RTL-SDR — the RTL-SDR Blog V4 or a NESDR SMArt v5 — is the sweet spot at about $35. The one part that matters is a TCXO: a temperature-compensated oscillator that keeps the dongle from drifting off the control channel as it warms up. Skip the no-name $15 sticks — the drift will cost you the lock. Full rundown: best RTL-SDR for scanning.
The antenna matters more than the dongle. The stub bundled with cheap sticks hears strong locals and little else. A telescopic dipole kit (~$25) you can tune to your band is a big upgrade you can set on a windowsill today, and it upgrades cleanly to an outdoor antenna later. See best SDR antenna.
The adapter exists because most SDRs use an SMA jack while antennas often end in BNC, UHF/PL-259, or N. A cheap adapter kit bridges whatever you have; a short pigtail or extension lets you place the antenna where the signal is.
Optional upgrades — add only if needed
- LNA (low-noise amplifier) — if your control channel is weak and distant, a wideband LNA (~$30) lifts it out of the noise. Best mounted at the antenna and powered up the coax by the dongle’s bias tee. Do not overdo gain — too much causes overload.
- Broadcast FM notch filter — in a city a strong FM or AM station can desensitize the dongle. A 88–108 MHz block filter (~$25) restores weak-signal reception.
- Active USB extension (~$15) — put the dongle at the window with the antenna and the PC wherever is convenient, without a lossy long coax run.
Put it together
- Screw the antenna (via any needed adapter) onto the SDR.
- Plug the SDR into a USB port.
- Download GopherTrunk and follow the hardware setup guide. On Windows, bind the driver with Zadig first; on Mac/Linux it just works.
- Enter your system’s control channel — look it up on RadioReference — and start decoding.
Want it always on instead of tied to your desk? The next step up is a dedicated Raspberry Pi build. Ready for real range? Move the antenna outdoors with the outdoor base build.
Where to buy
The cheapest complete route is the RTL-SDR Blog V4 + dipole antenna kit (~$50) plus an SMA adapter kit (~$13) — under $65 for the whole radio chain, software free.
As an Amazon Associate, GopherTrunk earns from qualifying purchases — at no extra cost to you. It never changes what we recommend.
Bottom line
A computer you own + a ~$35 dongle + a ~$25 antenna + a few-dollar adapter is the entire shopping list for a GopherTrunk PC build — about $60–80, or less with the bundle. Add an LNA or filter only if reception needs it. Everything hits the same encryption wall, so buy for the traffic that is in the clear. Compare the other setups on the build-lists hub.
Frequently asked questions
What do I need to run GopherTrunk on my PC?
Three things beyond the computer you already own: an SDR dongle (a ~$35 RTL-SDR Blog V4 or NESDR SMArt v5), an antenna (a ~$25 dipole kit to start), and usually an SMA adapter or short cable to join them. That is a complete GopherTrunk scanner for about $60–80, and the software is free.
Does GopherTrunk run on Windows and Mac?
Yes. GopherTrunk is a single Go binary that runs on Windows, macOS, and Linux. On Windows you bind the dongle’s driver with Zadig once; on Mac and Linux it works out of the box. Any machine from the last decade with a free USB port has ample power to decode a control channel or two.
How cheap can a GopherTrunk setup be?
If you already own a computer, about $60–80: roughly $35 for a good dongle, $25 for a dipole antenna kit, and a few dollars for an adapter. Buying the dongle-plus-antenna bundle is the single cheapest route because it puts both key parts in one box.
Do I need an LNA or a filter for a PC build?
Usually not to start. Add a low-noise amplifier only if your control channel is weak and distant, and add a broadcast FM/AM notch filter only if a strong local station overloads the dongle — a common problem in cities. Buy the base kit first, then add these only if reception needs it.
Can my laptop decode trunked radio in real time?
Easily. Following one or two control channels plus voice is light work for any modern laptop — it uses a fraction of one core. You only need more compute for large multi-dongle pools or wideband channelizing, which is a different build.
Will this PC build hear encrypted channels?
No. No SDR or scanner can decode AES-encrypted talkgroups. A PC build hears everything transmitted in the clear, which in most areas is plenty of dispatch and nearly all fire and EMS. Check your local system before buying so you know what is clear.