Bingfu 42.5-inch Foldable Tactical (SMA-Female) vs TIDRADIO TD-771 GMRS (SMA-Female)

The TD-771 is the clear winner for GMRS use, while the Bingfu serves a different purpose for VHF operators.

The critical difference is electrical length. The TD-771 operates at 0.60 wavelengths on GMRS, which is a true 5/8-wave design delivering realistic gain of 3.0 dBi without requiring a ground plane. The Bingfu presents a mixed picture: at VHF it's a proper half-wave with 2.6 dBi gain, but at UHF it becomes a multi-wavelength radiator at 1.57 wavelengths, which creates nulls and produces negative gain. The Bingfu's claimed 3.5 dBi gain is overstated and not supported by its electrical behavior across both bands.

The TD-771 wins on specialization, simplicity, and price at just 9.99 dollars. Its 385 mm length is optimized for GMRS handheld use where efficiency matters. The Bingfu costs nearly double and attempts to cover too much spectrum, succeeding on VHF alone but failing on UHF due to poor electrical length.

Buy the TD-771 if you need a single antenna for GMRS handhelds. Buy the Bingfu only if your primary band is VHF 146 MHz and you value its foldable design for portability.

Get the TD-771. It's cheaper, better engineered for its intended band, and more honest about its performance.