You only need a "hole" in the trees as wide as the dish. However trees grow and branches sway in the wind. And that is only for a dish hitting a single satellite. If you want high def you must hit more than one satellite with an oval dish. And the high def satellites are a little lower on the horizon than the single sat dish. So for high def you need lots of open sky.
You should check your signal strength on a clear day, one of the setup functions on the box. If you are getting 90% or more that is a good signal. 80% will work, but indicates you are being obstructed or are off target.
Trimming a few branches can make all the difference. However the ones you need to trim are usually very high.
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