This issue has always confused me...let me just tell you what I am seeing on my receivers:
* I am in the Washington DC DMA, subscribe to local channels, and receive programming from three satellite locations (110/119 and 61.5). My split locals are on 110 and 61.5.
* I have two OTA antennas: North antenna picks up DC and Baltimore MD, South antenna picks up Richmond and Charlottesville VA.
On the 811 receiver: I have an A/B switch for OTA but I typically keep it on the Richmond/Charlottesville antenna. The PG displays program data for the Washington DC channels, but I receive a generic (local digital or whatever) display for those channels picked up via OTA scan (Baltimore, Richmond, Charlottesville). I have never picked up PG data for any locals outside of my home DMA of DC...even when I had a 2nd 811. According to quite a few people, I should be able to populate the PG with data in the PSIP datastream provided by local broadcasters with the 811, but (other than channel identity information) I am not.
On the 942 receivers: Although at once time I plugged in Richmond/Charlottesville OTA antenna and scanned for locals, I keep this OTA antenna plugged into the back of my HDTV and use its internal ATSC tuner. I keep the DC/Baltimore antenna plugged into the 8-VSB port on both 942s. We'll believe it or not, except for for subchannels and couple of PBS/Independent channels, I pick up PG data for almost all channels in DC, Baltimore, Richmond and Charlottesville. Obviously, I am receiving PG data from these distant locals from the E* sats because I don't even keep the OTA antenna plugged in.
It appears that I am receiving PG data from the satellites for DC, Baltimore, Richmond and Charlottesville...basically, for any channel the 942 picks up via OTA scan. I'm not sure which sat the 942 receives its 9-day PG. Note: Richmond locals are on 105 and mirrored on 129.
It appears that I am only receiving PG data from the satellites for DC (home DMA). For channels picked up via OTA scan, the PSIP channel identity is displayed...but that's all.