My house is around 50 years old and has had a lot of amateurish wire modifications done over the years. I was only able to get HPNA to work with about 90% reliability. I finally broke down and bought two Linksys WAP11's to form a wireless bridge. It was a big expense but I'd grown to really like having all of my music in the living room and spending the bucks was still preferable to running ethernet through the walls and attic.

-Dylan