TWAYRDIO 7 Elementi UHF Antenna Yagi,11dBi 70cm 400-470Mhz Esterno 400-470MHz
The Yagi antenna is no need operates for a grounding in most cases. Generally speaking, antennas can be used normally when SWR under 2.0. If your antenna's swr is too high,we will be happy to analyze and solve for you.