I have been struggling with Moca Adapter for about two months. Tried two different adapters. No luck. Can't hook ethernet because of location of Premier 4 (Host). Wiring Cat5 or 6 was cost prohibitive.
Talked to Tivo, they said I could not go wirelessly because I am creating whole home with 2 Mini's.
After much trial, figured that was my only chance. Talked with Apple Genius (my network uses Airport Extreme as wireless router). He suggested that what I had in mind should work -- it did. Here it is:
Use a wireless extender with LAN out to hook up to P4. Create a Moca network (P4 is a bridge so no adapter needed), hook Mini's up to Coax.
Just as fast and clear as direct ethernet connection.