ABBREE AR-771C GMRS (SMA-Female) vs Comet SMA-24J (SMA-Female)

The AR-771C is the clear winner for GMRS use. It delivers genuine 5/8 wavelength performance at 465 MHz with realistic 3.1 dBi gain, while the SMA-24J's claimed 3.5 dBi is overstated marketing. The single most important differentiator is electrical length on your intended band. The SMA-24J is a dual-band compromise antenna that performs reasonably at UHF (0.65 wavelengths) but falls apart on VHF at just 0.22 wavelengths, where it's electrically undersized. If you operate primarily GMRS, the AR-771C's superior electrical length at 465 MHz gives it a real performance edge, and at under nine dollars, it's a no-brainer. Buy the AR-771C if you transmit on GMRS or primarily operate UHF frequencies where you need efficient radiation. Buy the SMA-24J only if you need occasional dual-band flexibility and can tolerate compromised VHF performance. For dedicated GMRS work, the AR-771C's focused design, better electrical efficiency, and exceptional value make it the better choice. The SMA-24J's higher price and overstated specs don't justify switching away from a purpose-built alternative.