The 1000 and 2000 don't have any more or any less of an RF passthrough than the 4000 or the Samsung. They all take an external aerial input, add the current picture and sound, and the output it again. This is, as far as I know, exactly what the 4010 does too.
The first three (I think) revisions of the 4001 added the terrestrial channels taken directly off the cable, but this is not relevant to Pea-Pod.