I guess I need to make one of those and try it out. But I will need to figure out how to do the placement height adjustment. The roof of the house is an option for placing a dish if that would open a view that no viable ground position would do. But I don't want to try to get on the roof myself.Then go through the birds one at a time, and check off where you can see clear sky through the straw.
When done, you should have your own private list of visible satellites.
Knowing which way a dish on someone else's house is aimed is far too imprecise to be of much use, in my opinion.
One other option: my brother lives across the street and has a much clearer view to the west despite being downhill from me. But he has a terrible OTA view and I have a decent one (being up high and no high trees to the NE). So I was thinking about what we might do to trade signals if I can find a fiber optic modulator suitable for the frequencies coming out of the LNB.