Use the SureLock for a fool-proof way to locate a TV signal no matter where you are. If your antenna can get the signal, the SureLock can find it. Since the digital transition in 2009, pointing your directional RV TV antenna is difficult and often time consuming. Unless you are pointed at the TV tower, you won't get channels when doing a channel scan. But you don't know if you are pointing at a tower unless you can do a successful channel scan. The SureLock was designed to simplify this process and ease your frustrations. The meter connect in-line with your TV antenna, provides LED feedback for signal strength and has a variable sensitivity adjustment to work both near and far from the TV towers.