Jerry the best way to check if trees will be in your way (besides actually trying to find a signal) is find out the offset amount of degrees for your dish. If you have a Fortec 90cm, the offset is 24.62 degrees. So calculate the elevation for G10R ; lets say for example it turns out to be 30 , then find the offset, and add both. So 30+24 = 54. Or 55 we can say.
So point your dish to G10R's azimuth and lift your dish on it's scale to 55 and the dish will exactly be pointing to where the signal is coming from. Like this you can determine if you will catch signal.
Of course, you will get no signal and quality like this, because offset dishes work when they are offset. You would have to subtract 55-24 again to get 30 and thats where you should leave the dish for signal.
to pmb1010:
I see you have one of those nice
classic Fortec LNBs with the 0.5db. I want those so much, I like the casing much better than the new 0.4 lnb fortecs.