I'm not a very big fan of the powerline adapters. They won't work if they're attached to a surge protector or a UPS, they won't work if the circuits are on different phases, they won't work if the outlets are electrically isolated from each other in the circuit breaker panel for some reason. If the breaker is a GFCI breaker it can create problems, fans, Compact Florescence lights, motors, and switching AC/DC power supplies can all cause data interference. The list goes on.
That said, many people do use them quiet successfully, I just don't like them because of all the many things that can interfere with reliable data transfer and break communications all together.
Instead I really enjoy using MOCA adapters. I followed the advice over on this thread
in another forum for using two verizon routers as a MOCA bridge to transmit Ethernet over Coax lines. A quick summary is:
The device we're using is the Actiontec MI424WR. Find one that is at least Rev. D. The newest Rev is a gigabit router with Wireless N. MOCA speeds will be equivalent to 100Mbps Ethernet (I tend to get just north of 100Mbps using two devices).
There are two limitations of MOCA
1) You have to have a coax connection nearby, but many modern homes have a coax adapter in almost every room
2) It uses frequencies greater than 1000 Mhz for data transmissions. Satellite also uses this range. So MOCA 1.0 is incompatible if you're using Satellite, you would need to use MOCA 1.1 or MOCA 2.0 (MOCA 2.0 exists, but I haven't seen anyone using it yet). Starting with Rev F the MI424 uses MOCA 1.1 so you could use that with Satellite.