Yes, all your paying for is the rental of the box, not the service going to it. The house is already piped with service. The money they charge you is equipment usage charges. He should be able to hook it up at his house no problem (pending he has comcast) because sometimes providers have only certain units that will work with their service, and you cannot use certain boxes from one provider on another providers lines... But if he is on comcast, it shouldnt be a problem!
Worked fine, thanks for the reply!