PCTEL Maxrad - 3/8-3/4" Hole Brass Antenna Mount Only The PCTEL Maxrad BMA38 vehicle roof mount antenna installation hardware kit is for Motorola-style mobile antennas 0-1000 MHz. This mount is a brass permanent mount for a 3/4 or 3/8 inch hole. The PCTEL mobile antenna mount requires you to purchase cable and connectors separately. Thread size is 1 1/8 inch - 18. Compatible With: Motorola-style mobile antennas