On a CB, the antenna – not the radio – decides how far you reach, and Firestik’s tunable fibreglass whips are the trucker and off-road favourite for a reason: they are tough, they tune to a low SWR easily, and they just work. The trick is matching the antenna to your vehicle (steel body or fibreglass), your clearance (how tall you can go), and your use (highway range vs trail flexibility).
Below are four Firestik antennas that cover those cases, plus the one accessory every install should add. They are all tunable-tip models, so plan to set them with an SWR meter after mounting.
Top picks at a glance
- Best overall: the Firestik FS-4 – 4 ft of tunable range.
- Off-road / lightweight: the Firefly FL3 – thin and flexible.
- Fibreglass RV: the FG4648-B no-ground-plane kit.
| Firestik antenna | Length | Type | Best for |
|---|---|---|---|
| Firestik FS-4 (4 ft) | 4 ft | Tunable fiberglass | Best range |
| Firestik Firefly FL3-B (3 ft) | 3 ft | Flexible fiberglass | Lightweight / off-road |
| Firestik FS-3 (3 ft) | 3 ft | Tunable fiberglass | Standard 3-ft |
| Firestik FG4648-B No-Ground-Plane Kit | 4 ft | No-ground-plane kit | Fiberglass RVs |
1. Firestik FS-4 (4 ft) — Best overall
The 4-foot FS-4 is the Firestik most people should buy: the extra length over a 3-footer means noticeably better range, the tunable tip lets you dial in a low SWR exactly, and it shrugs off highway speeds and car washes. It is the highest-rated full-size Firestik here. The catch: At 4 feet you need to watch garage and low-clearance heights.
Verdict — Buy it: the best balance of range and durability for most trucks and RVs.
2. Firestik Firefly FL3-B (3 ft) — Best lightweight
The Firefly is thinner and more flexible than the standard FS series, so it bends out of the way of branches on the trail and is gentler on a light mount. It is the most-reviewed antenna on this list and a favourite for Jeeps and off-roaders. The catch: The slim build is a little less rugged than the thicker FS-4.
Verdict — Buy it: the pick for off-road and tight, branch-heavy trails.
3. Firestik FS-3 (3 ft) — Best 3-foot all-rounder
When 4 feet is too tall for your garage or load height, the 3-foot FS-3 is the standard choice – same tunable-tip quality, just shorter. It keeps clearance manageable while still performing well on a metal-bodied vehicle. The catch: Slightly less range than the 4-foot version, as physics demands.
Verdict — Buy it: the right call when clearance rules out a 4-foot whip.
4. Firestik FG4648-B No-Ground-Plane Kit — Best for fiberglass / RVs
A normal CB antenna needs a metal body to work against (a “ground plane”). Fiberglass RVs, campers and plastic-bodied vehicles do not have one, which is why standard antennas struggle on them. This NGP kit includes the special coax that solves it – the right choice for most motorhomes. The catch: Overkill (and pricier) if your vehicle has a steel body.
Verdict — Buy it: the antenna to get if your RV or vehicle body is fiberglass or plastic.
5. Firestik SS-3H Heavy-Duty Spring — the accessory you also need
Not an antenna, but the part that saves one. A stainless spring at the base lets the whip bend and snap back when it hits a garage doorway, a low branch or a car-wash arch instead of snapping off. The SS-3H is the most-reviewed Firestik part of all, and at the price it is cheap insurance for any fibreglass whip.
Verdict — Buy it: add it to whichever antenna you choose – it pays for itself the first time you forget about a low clearance.
How to choose a Firestik antenna
Three questions sort it out. Does your vehicle have a metal body? If yes, a standard FS-3/FS-4 works; if it is a fibreglass RV or plastic-bodied vehicle, you need the no-ground-plane kit. How much clearance do you have? Taller gives more range, so go 4 ft if your garage and load height allow, otherwise 3 ft. Where do you drive? Highway miles favour the rigid FS series; tight, branch-heavy trails favour the flexible Firefly.
Whichever you pick, the antenna only performs once it is tuned. Set it with one of our best SWR meters, make sure the mount is grounded to bare metal, and add the spring above. Range comes from a tuned antenna, not power – the FCC caps CB at 4 watts. For a different brand, see our Wilson 1000 vs 5000 comparison, and browse the CB antennas hub.
Firestik antenna FAQ
What size Firestik antenna is best?
Taller is better for range, so a 4-foot FS-4 outperforms a 3-foot model – choose it if your clearance allows. Drop to a 3-foot FS-3 or Firefly when garage or load height is tight.
Do I need a no-ground-plane antenna for my RV?
If your RV or vehicle body is fibreglass or plastic, yes – a standard CB antenna has nothing to work against and will perform poorly. The FG-series no-ground-plane kit includes the special coax that fixes it.
Do Firestik antennas need tuning?
Yes. All Firestik whips have a tunable tip; after mounting, you adjust the tip length to a low SWR with an SWR meter. It takes a few minutes and is essential for range and to protect the radio.
Why add a spring to a CB antenna?
A spring at the base lets the antenna flex and recover when it strikes a low obstacle – a garage, branch or car-wash arch – instead of snapping. The Firestik SS-3H is a popular stainless option.
Single antenna or co-phased pair?
A single antenna is right for most trucks and RVs. Dual co-phased antennas mainly help large vehicles like semis with a long, flat roofline; for an RV or pickup, one well-tuned antenna is simpler and effective.
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