Best Practice Pays Off (for sure)
Quick update. Installer showed up at 8:30 in a 8-12 window. Had the 24" dish as planned.
On the ground, he was skeptical as to whether or not we'd be able to get LOS to the Voom bird and after getting up on the roof, he still wasn't sure - but didn't hesitate to give it a shot. He mounted the dish as high as he could reach to the OTA antenna mast (which is very stout BTW

) standing on top of an 8' step ladder straddling the peak of the roof (not a steep roof by the way) and I held the ladder steady while he was working.
Got the coax run to the STB to power up the dish and we went back up to peak it with his meter. On the way down to see the results off the STB, I asked him what the best signal was that he typically saw in my area. He said 96 and once he saw a 97. We got down to the TV and we had a 96 - cool beans!
As far as OTA goes, we used my existing antenna (Channel Master Quantum 1160A with preamp - older version of the Channel Master 3671 deep fringe antenna). After doing the channel scan, we got all the channels except for a couple my Samsung ATSC tuner gets, including a couple from the Bay Area (Sacramento is my DMA) which is almost 100 miles away (I live at 1300' MSL so have some antenna height going for me). I think it said I got 31 channels, which must include the sub-channels as well.
The installer had suggested we use my exiting OTA coax for the dish feed and I politely declined in order to avoid using a diplexer - no issue on his part and we ran a separate coax for the dish.
So - good results so far. STB downloaded 7.33 within 30 minutes of getting authorized and I've been doing a little surfing comparing the Voom PQ to what I get on C-Band. So far I'd have to say the Voom HD is just as good as C-Band (for those not familiar, C-Band is used to convey most of the programming from the head end to distributors such as Voom, D*, E*, cable companies, etc. and the PQ is as good as it gets). SD is pretty darn close to C-Band, and a lot better than what I've seen on friends E* and D* systems.
Anyway, I just wanted to post some more positive comments about a Voom install as happy people don't always post. I know I was a little worried after reading some of the horror stories folks have gone through with their installs, and probably can confirm that a good installer makes all the difference. I continue to feel for the folks who aren't as lucky in the install area, and also hope that as unfortunate as a bad install is, it is the minority case.
To honor Gill (aka "seattlesatelliter" over on the Yahoo Voom board)
Now watching HDTV (with Voom) under clear and sunny Northern California Skies,
Doug