Yaesu ATBK-100 Antenna Base Kit is an OEM accessory that features coil-loaded radials. Specifically designed for the ATAS-120A and ATAS-100 Auto Active-Tuning Antennas, this product provides VHF and UHF operation when the antenna system is used on the go. The item must not be mounted on a vehicle. This base kit is not intended for mobile operation and needs a fixated point for proper use.