Ok, the coax was run through a hole in the soffit and then up to the satellite dish. So, I should be able to use the existing coax and extend it if need be.
The dish is mounted on a j-mount like this one:
http://www.3starinc.com/ds-3000_j_mo...na_ds3000.html
Is it possible to use the DirecTV mount for the HD7698P?