FM Loop Antenna Outdoor, Attic-mount and RV FM Antenna Very high quality FM Loop antenna. Designed for installation at your home (outdoors or attic), office or on an RV Heavy duty construction features very high quality tubing, stand-offs, integrated balun and attaching hardware Easy to assemble in under 3 minutes; Unlike competitors - this model is a larger 21.5" diameter Provides great improvements in FM reception of analog and digital signals versus indoor dipole or whip antennas No additional parts needed - attach your 75 ohm coax (instructions enclosed, including recommended grounding and safety details)