If I put up an antenna with a rotor, will I have to rescan for the channels on my 722K everytime I move the rotor back and forth between the 2 markets I will be picking up with it?
I'm pretty certain you won't have to re-scan. In my case, the channels still appear on the guide and it will attempt to tune even if the signal has been lost, so once all the channels have been put into memory, they should always appear on the guide for access. However, as Bobby said, after you scan for the fist set of channel, you will probably have to add the 2nd set manually after moving the antenna. You should then end up both sets on the guide.