Replace old style box with a new one - DirecTV

This question is about "Replace old style box with a new one", with DirecTV channels, programming, equipment, and sports. We have 2 houses. Want to have just one box, we move it from old to new house, and then back again as we travel.

Old house has the old DTV box, HD, with 2 cables from antenna.
New house has new box, HD, nicer remote, more memory, and just one cable from antenna.

Q-How do I get the new new box to work in the old house? Does the old HD antenna have to be replaced? What to do with the 2 cables, with only one connection point with the new box?

Reason - We prefer the capabilities of the new box and so we can return the old box.

This topic covered Replace old style box with a new one, and DirecTV satellite tv service.