A basic rule of thumb for a "wireless" system is the closer the transmitter is to the monitor, the less chance for any interference. My Yada operates on 2.4GHz frequency. About the only time you will experience interference / picture quality is when you're in proximity of other devices operating on a same frequency. I eliminated interference completely by locating my transmitter closer to the monitor, even when I'm in my driveway at home.
PS: My Yada also has night vision, It's clear as day, even at night.