I saw this first hand yesterday on my 722. Ever since my CBS station moved from RF 46 to RF 9 at a very low power I've had nothing but issues with RF 9 OTA. Long story short..it's the typical issue where you read people in the city can not get it but yet you drive another 10 miles away from the transmitter with the same antenna and tuner and it works fine.
I was adding a homemade dipole to my CM4228. I had my phone with my slingbox pulled up on it at the local channel screen watching the signal. Too lazy to drag a TV up there! As I was fiddling with the connector attaching my dipole...boom signal acq screen for 129! What? I'm not even near the 129 dish! And it's perfect skies today. I fiddle with it and get it back to my locals screen. As soon as I start messing the antenna...boom 129 signal acq screen. I smiled and thought to myself "This is what these guys are talking about!".
So the problem is there....