MrDan, you stated you use a multiplexer/diplexer outside. I like this idea because it would allow me to utilize the one set of coax already run in the house.
As for everyone else, what have you done? If you have a tenant who wants to install DirecTV, what do you do? Do you let the installer run new coax through the wall? Did you wire the house with two separate runs of coax, one for DirecTV and one for cable TV/internet? Do you use a diplexer as MrDan suggested?
Interested to know what other's solution to this dilemma is. Thanks!