Use the SureLock to pinpoint the location of local TV towers before doing a channel scan for simple, fool-proof antenna pointing. Greatly reduces set-up time and frustration by eliminating the need for multiple channel scans in different directions. Simple plug-n-play design connects to any available TV antenna output or may be installed inline between the antenna and TV. Rotate the antenna until the maximum number of LED's are illuminated in the signal meter, then run a channel scan. Variable gain control feature let's you adjust sensitivity for optimal resolution in both strong and weak signal areas. For use with any over-the-air TV antenna. 3"H x 3"W x 1"D.