I have a simple setup now. Two receivers, HR21-700, HR20-700. I have two coax cables running to each of the receivers. I do not use a multi-switch. If I wanted to add two TV's, two non DVD HD receivers and then WHDS what would I need. I do not use Deca or SWIM right now. Both receivers are on wired Ethernet, I called and activated WHDS unsupported. But I want to add the TV and HD receivers without adding additional DVR. Do I need a multi switch or can I go to SWIM and DECA for WHDS.