Also known as: outdoor scanner antenna, rooftop scanner antenna, fixed base antenna
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A base scanner antenna is the outdoor, fixed-station antenna for a home scanning setup — mounted on a rooftop, mast, or eave, and fed indoors by coax to a scanner or SDR. It is the single biggest upgrade available to a fixed listener, because height and a clear horizon do more for reception than any change of receiver. This page is the “one outdoor antenna” buyer’s pick; the individual antenna types — discone, ground-plane vertical, and collinear — have their own detailed pages.
Choosing one outdoor antenna
Nearly every fixed scanning station comes down to one trade-off: bandwidth versus gain.
- Wideband discone — a discone covers a decade of frequency (roughly 25–1300 MHz) from one feedline at modest, near-unity gain. It hears aviation, marine, public-safety trunking, and business bands without swapping hardware, which makes it the natural “do everything” scanner antenna and the default recommendation for a first outdoor install.
- Band-cut vertical or collinear — a ground-plane vertical or a collinear gives more gain, but only across its design band. If you concentrate on one region’s VHF or UHF trunking, one of these hears weak sites a discone would miss.
- Directional Yagi or LPDA — a Yagi or log-periodic adds real forward gain and rejects interference, but only in the direction you aim it. It is an add-on for one stubborn distant site, not a general base antenna.
For most people the honest first buy is a wideband discone: it maximizes the number of systems you can hear from a single antenna, and you can always add a band-specific or directional antenna later if one system needs more signal.
How it works
A base antenna is almost always a vertical, omnidirectional radiator, vertically polarized to match land-mobile signals and radiating toward the horizon with a null overhead. The discone achieves its enormous bandwidth by being a frequency-independent shape — a disc over a flaring cone whose continuously changing dimensions keep the feedpoint near 50 Ω across a wide range, so SWR stays low without retuning. A ground-plane or collinear, by contrast, is a resonant design tuned to one band, trading that breadth for gain.
Whatever the type, the install dominates the result. Mount the antenna above the roofline on a mast or eave mount, clear of metal and obstructions, and keep the feedline short and low-loss — a long run of thin coax can throw away several dB at UHF and undo the whole upgrade. Bond the mast and add a coax surge arrestor with a proper grounding kit for safety, and weatherproof every outdoor connector.
Relevance to GopherTrunk
For a fixed GopherTrunk station, the base antenna is usually the single most valuable piece of hardware after the SDR itself. GT decodes whatever the front end delivers and cares only about signal-to-noise, and an outdoor vertical mounted high with a clear horizon delivers a far stronger, cleaner signal than any indoor whip — improving lock on weak control channels across every band GopherTrunk supports. A wideband discone in particular suits GT’s multi-protocol, multi-band nature: leave it connected while monitoring P25, DMR, NXDN, and TETRA systems scattered across the spectrum. No antenna, however, defeats encryption — a base antenna improves reception, never decryption.
Where to buy
For one outdoor antenna that covers everything, a wideband Tram 1411 super discone (25–1300 MHz, around $59) is the usual answer: a single feedline for VHF, UHF, and beyond, omnidirectional so it hears every trunking site at once, and vertically polarized to match land-mobile traffic. Mount it as high as you can with a clear horizon and keep the coax short.
If you focus on one band and want more range, compare a ground-plane vertical or a collinear; for a stubborn distant site, add a Yagi. The full line-up is in the best scanner antenna guide and best SDR antenna guide.
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Sources
Frequently asked questions
What is the best outdoor base antenna for a scanner?
For one antenna that covers everything, a wideband discone like the Tram 1411 (around $59) is the usual answer: 25–1300 MHz from a single feedline, omnidirectional, and vertically polarized to match land-mobile P25/DMR/NXDN traffic. Mount it as high as you can with a clear horizon. If you instead focus on one VHF or UHF band and want more range, a gain vertical or collinear beats a discone there; if you chase one weak distant site, add a directional Yagi.
Discone, vertical, or collinear for a base station?
It is a bandwidth-versus-gain choice. A discone covers a huge frequency range at modest (roughly unity) gain — best when you monitor many bands at once. A band-cut vertical or collinear gives more gain but only across its design band — best when you concentrate on one region’s VHF or UHF trunking. Most listeners start with a discone for its do-everything breadth, then add a band-specific antenna if one system needs more signal.
How high should a base scanner antenna be mounted?
As high and clear as practical — height and an unobstructed horizon matter far more than the antenna model. A vertical radiates toward the horizon, so a rooftop or mast mount above the roofline, clear of metal and obstructions, is worth more than any upgrade in antenna type. Keep the coax run short and low-loss, and use proper low-loss cable for a long masthead run.
Do I need to ground an outdoor scanner antenna?
Yes, for safety. An outdoor mast and coax should be bonded to your home’s grounding system and ideally fitted with a coax surge/lightning arrestor, per your local electrical code. This protects the receiver and the house from static buildup and nearby strikes. Weatherproof the connectors, too — water in coax raises loss dramatically.