14dBi Is Useless on the Wrong Band: Maple Antennas Explained
Quick Answer
Choose a directional antenna by frequency and polarisation before gain. Maple’s 0.9GHz Yagi suits a compatible sub-GHz control or telemetry ground station; the 1.2GHz patch is for matching video receivers; the 5.8GHz panels suit video links. A 21dBi label cannot rescue a band or polarisation mismatch.
The Four Numbers We Check Before dBi
We stock Maple antennas spanning three very different jobs, which makes the gain figure a poor starting point. Check operating band, polarisation, connector and beamwidth in that order. Our FPV frequency guide explains why a 900MHz control link and a 5.8GHz video link are not interchangeable.
The Maple Wireless 0.9GHz 14dBi Yagi covers 850–930MHz and concentrates reception into a listed 35° half-power beam. That makes it a ground-station antenna for a compatible sub-GHz radio link, not a video upgrade for a 5.8GHz receiver. If it is used to transmit in the UK, antenna gain forms part of the radiated-power calculation: a 14dBi Yagi does not override Ofcom’s band, power and access conditions.
The Maple Wireless 1.2GHz directional patch instead covers 1080–1360MHz, with 12.8dBi listed gain, less than 1.5 VSWR and a ±30° half-power beam. At 410 × 240 × 65mm and 924g, it belongs on a tripod or antenna tracker. We would not hang it from goggles, and we would not recommend 1.2GHz airborne video to a UK hobby pilot without the appropriate radio authorisation.
17dBi or 21dBi for a 5GHz Video Link?
The Maple 5.8GHz 17dBi panel is the practical choice for most compatible 5.8GHz ground stations. Its listed 5180–5950MHz coverage is broad, the panel weighs 47g, and its 16° horizontal by 38° vertical beam gives useful elevation tolerance. It is linearly polarised, so pair it with a linear transmit antenna in the same orientation.
The Maple 21dBi 5.5GHz panel is more specialised. It weighs 162g, narrows both planes to 15°, covers 5180–5800MHz on its 5.5GHz version and is optimised around 5500–5600MHz. We would choose it only when the exact channel is inside that range and an antenna tracker can keep the aircraft within the tighter beam. For hand aiming or broader 5.8GHz channel coverage, buy the 17dBi model.
Our Ground-Station Rule
Directional gain trades coverage for focus; it does not create power. Read our antenna gain guide, then verify the transmitter frequency, receiver connector and polarisation against the antenna label. Start with low power and close-range checks, keep an omnidirectional diversity antenna where the receiver supports one, and never let a high-gain panel tempt you beyond visual-line-of-sight or spectrum rules. Browse the verified antenna collection by link type rather than sorting by the largest dBi number.
FAQ
Q: Can the 0.9GHz Yagi receive 1.2GHz video?
A: No. Its listed range stops at 930MHz. Use an antenna designed for the video receiver’s actual frequency.
Q: Is 21dBi always better than 17dBi?
A: No. The 21dBi model has a tighter 15° beam and narrower stated coverage. It wins only when frequency, polarisation and aiming are correct.
Q: Can I mix linear and circular polarisation?
A: A signal may still appear at short range, but the mismatch wastes link budget. Match linear with linear, or match RHCP/LHCP exactly at both ends.