The FM-10A-Loop is a heavy-duty, high performance FM loop antenna 21.5 inch diameter FM loop (larger than competitive models). 360 degree reception - greatly improved reception versus internal or simple indoor dipole antennas. Heavy duty aluminum construction. Built-in balun - directly connect to your 75 ohm antenna line (your 75 ohm coax - not included). Includes mast attachment hardware (no mast included, no coax included); easy to install. Ideal for permanent installations at home (outdoors or attic installation) and office; also works fine on RVs and other semi-permanent installations. Need a more directional antenna - see our listing for a 3-element FM Yagi on Amazon - ASIN: B01DWE9I9O