This may be of interest to any HR10-250 users, I read on the Tivo community forum that the Hr10-250 has a picky OTA tuner. This is probably not new info to many. That said, there is a thread over there outling a tweak to "enhance" reception.
With my Radioshack powered antenna I get all 3 local that are HD with around 70 - 90% strength, regardless of what gain I set or where I place the antenna. If I go into the signal meter on my Tivo I always see one tuner with higher signal than the other or one locked on to whatever strength and the other bouncing. I thought maybe I was in a bad area getting multipath.
Back to the fix, under the hood of your HR10-250 are 2 coax lines to the OTA tuner from the splitter. It may be worth getting it topless to check the connections. I found mine to be loose on one connection. A quick re-connect and my signal levels fluctuate equally now. There is also mention in the thread of replacing the coax in the unit with RG6 grade to further enhance the reception. Hope it helps, it seems to help me.http://www.tivocommunity.com/tivo-vb...d.php?t=312472