Maybe I'm missing something, but a Voom box no longer qualifies as a satellite receiver. I don't see how it's any different than any other OTA tuner (except that it's not as user-friendly.) Compression is not a factor, AFAIK.
Digital to analog conversion is a concern on any STB with component outs, but it's certainly not a showstopper and the Voom box does have DVI out in any case.
The real problem is on the DVR side. Due to copy protection restrictions, the LG 3410A does NOT have digital inputs, so you're not going to get true HD but downconverted SD. I don't know of any other HD DVR that's any different.
There are some folks who have experimented with capturing Voom OTA on a PC, and a search of the HDTV Hardware forum should point you in the right direction if you're interested.