14dBi or 12.8dBi? Why the Bigger Number Picks the Wrong Antenna

Quick Answer

Choose the 0.9GHz Yagi for a compatible 868/915MHz control or telemetry ground link. Choose the 1.2GHz patch for a compatible 1.2/1.3GHz video receiver. The 14dBi and 12.8dBi labels look comparable, but frequency and polarisation decide whether either antenna works at all.

The 1.2dB Difference Is the Least Important Difference

Our two new Maple Wireless listings make an easy buying mistake possible. The Maple Wireless 0.9GHz 14dBi Yagi covers 850–930MHz. That includes the 868MHz region used by European sub-GHz equipment and the 915MHz region used by systems configured for other regulatory domains. Its linear, vertically polarised array is intended for a fixed ground station pointed towards the aircraft.

The Maple Wireless 1.2GHz 12.8dBi patch covers 1080–1360MHz and belongs on a compatible video receiver or ground station. It is a circularly polarised panel, so its handedness must match the aircraft antenna. Connecting it to a 900MHz control module because the gain figure looks close will not create extra range; it creates a severe frequency mismatch.

What the Specifications Change in Practice

Specification	0.9GHz Yagi	1.2GHz patch
Frequency range	850–930MHz	1080–1360MHz
Listed gain	14dBi	12.8dBi
Polarisation	Linear, vertical	Circular; match RHCP or LHCP
Half-power beam	35° horizontal and vertical	±30° at -3dB
Listed size	980 × 190 × 30mm	410 × 240 × 65mm
Our pick for	Static 868MHz control/telemetry station	Compatible 1.2/1.3GHz video receiver

High gain does not manufacture power. It concentrates reception or transmission into a narrower direction, trading coverage behind and beside the antenna for reach ahead. Our practical rule is simple: use a directional antenna only when you can keep the aircraft inside its main beam. For circuits around yourself, an omni or a diversity setup is less fragile.

The Yagi listing specifies a 35° half-power beam and at least 15dB front-to-back ratio. The patch offers a wider ±30° -3dB beam and weighs 924g, while the Yagi is a 980mm two-piece assembly. That makes the patch easier to aim but heavier; the Yagi is lighter and more awkward to transport. Browse our verified antenna collection by frequency first, not by the largest dBi number.

The UK Check We Would Do Before Connecting a Transmitter

A receive-only antenna does not transmit, but the same hardware can alter radiated power when connected to a transmitter. Ofcom limits are stated as radiated power, so antenna gain forms part of the total. The current IR2030 includes 868MHz short-range-device conditions with 25mW e.r.p. limits and spectrum-access or duty-cycle requirements; a 14dBi antenna is not permission to ignore them.

Do not assume that buying a 1.2GHz video antenna authorises airborne 1.2GHz transmission in the UK. Check the complete transmitter, frequency, power and authorisation before use. Our 1.2GHz interference article also explains why the second harmonic can trouble a 2.4GHz control receiver. For planning the full link rather than one component, use our antenna selection and range-testing method.

What We Would Actually Buy

For an EU_868 ELRS or European Crossfire ground station with deliberate aiming, we would choose the 0.9GHz Yagi and calculate the legal link budget before transmitting. For a properly authorised 1.2/1.3GHz video ground receiver, we would choose the patch and match circular polarisation and connector. We would never choose between them on gain alone.

FAQ

Q: Can the 1.2GHz patch work with 868MHz ELRS?

A: No. Its 1080–1360MHz operating range does not cover 868MHz. Use an antenna designed for the transmitter's actual band.

Q: Does 14dBi guarantee more range than 12.8dBi?

A: No. Gain is only useful when frequency, impedance, connector, polarisation, aiming and legal power all match the system.

Q: Can I put either directional antenna on the aircraft?

A: We would not. Both are ground-station hardware; the Yagi is nearly a metre long and the patch is listed at 924g.