The SMA-F high gain Antenna will allow you to get longer range on your handheld radio Ailunce HD1 SMA-F connector; length approx 14.17inches; dual frequency 136-174 and 400-480MHz and widely application field Gain 2.15db; max power 20w; it can boost signal to improve the reception and transmission It uses ABS material and heat shrinkable sleeve; you can use it for a long time SMA-F antenna compatible with Ailunce HD1 Retevis RT29 RT86 RT5R RT5RV RT26 RT56 RT43 RB25 RT10 RB27V Baofeng BF-F8HP UV5R UV-82 Kenwood TK-250 and more