My friend is a Verizon Wireless customer. He barely had one bar of service inside his house. Verizon sent him a FREE extender. He now gets 5 bars inside house.
I am an XM customer. Prior to the installation of his extender, when I was at his house I got the same intermittent one bar. Now with his extender, I get 5 bars inside his house.
So if you are an XM customer with signal problems inside your house AND you have a friend on Verizon Wireless who is willing to use their credentials for an extender install in your house, it will work. The extender has a MAC address which has to be registered with Verizon hence the need for a Verizon account.
XM says they cannot register an extender and they cannot tell Verizon to do it on behalf of an XM client. Strange.