The AKU4-S-MAST 4dB Radome UHF Short Mast for the AKU4RDTWIN Antenna Kit. The mast is made of 23mm tapered black fiberglass, ensuring durability and longevity. The mast comes factory pretuned, ensuring optimal performance right out of the box. With its high gain, this radome UHF long mast enhances signal reception and transmission, making it an ideal choice for various communication needs.