Review on High Gain Retevis SMA-F Walkie Talkie Antennas - 10 Pack, 2.15dBi Dual Band Antenna for Baofeng UV-5R and Retevis 2 Way Radios by Carrie Tunks

UPDATE: Make sure your radios have female antennas and that they are unfixed. If you buy them for the right radios, they work AMAZING. With their help I intercepted the radio traffic from all over the metropolis. The H777 worked brilliantly for our medical team at a large outdoor event. There are two types of rt21. So if you buy them for rt21 make sure you don't have fixed antennas. There are no instructions for installing on rt21. Received it late yesterday and tried to install it. No video or information online. I tore off the RT21 antenna and figured I should just unscrew the factory installed antenna and then screw this in. no The radios look good but it's very frustrating and takes away from the main reason I bought them.