MFJ Enterprises Original MFJ-310 Handheld Antenna Window Mount Clip - BNC Connector HT Window Mount Clip, SMA Connector, 10 ft. Flexible Mini RG-58 Coax MFJ's Window Mount clip is made of sturdy metal and will give you years of trouble-free service. MFJ-310 works with any 2 meters, 220 MHz, dual band or any other handheld that uses a BNC antenna connector. MFJ-310 comes with 10 feet of lightweight and flexible mini-coax that makes it easy to handle your handheld.