KD7PTN Take a SO-239 chassis mount female coaxial connector and solder four lengths of coat hanger wire to the base after crimping them to the empty screw holes. Take a fifth piece of coat hanger wire and solder it to the center conductor. This makes a simple groundplane. Plug a PL-259 male coax connector into this and the other end ot your rig and you're all set. The lengths of the coat hanger wires should be 5/8 or 1/4 wavelengths of the operating frequency. Mount the antenna on a broom handle and stick it on the roof.