Comet CA-2X4SRNMO Dual-Band Mobile vs Retevis 7.2dBi High-Gain GMRS Mobile

The Comet CA-2X4SRNMO is the clear winner here. It's a legitimate dual-band antenna with electrical lengths that actually work, whereas the Retevis is a single-band GMRS antenna making an overstated gain claim.

The single most important difference is electrical design. The Comet operates at 0.49 wavelengths on VHF (proper half-wave performance) and 1.47 wavelengths on UHF (multi-wavelength collinear design). The Retevis claims 7.2 dBi but doesn't publish its electrical length, which is a red flag. GMRS mobile antennas at this price point typically run 5-6 dBi realistically; the claimed figure appears inflated.

The Comet suits anyone needing dual-band VHF/UHF coverage on a vehicle, particularly hams wanting one antenna for both 146 MHz and 435 MHz operation. The Retevis is for GMRS-only operators who want a simple single-band solution, but understand that 7.2 dBi is marketing, not physics.

Buy the Comet if you want honest performance on two bands and better value. The higher overall score and proper electrical design make it the straightforward choice for most mobile operators.