I'm really not sure if they would or not. I can tell you this though. The Sirius Echo repeater system does not work well in a home that has cordless phones that run on 900 mhz. The delphi repeater for XM does not have these problems with those phones. This indicates to me that they should work in the same household.
WOW! This is some very important news. I'm sorry that it didn't work out as we had hoped, but knowing this now is huge for everyone else.
I'm really sorry to hear that using both of them in the same household did not work out.