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I have never had a dish peaked correctly on the first visit ( initial install ). Every single house, I had to get someone back out to re-peak.
No offense to anyone. Just has just been my experience.
IT all depends on your dish peaking. If you have a good line of sight and good sat numbers , you suffer from less rain fade. If it is raining cats & dogs , you will see your picture go out regardless if you have a good dish peaking. The only way around it is to have a larger dish to ensure that you don't lose your signal. Say three 30" sat dishes , one for each satellite in your matrix: 77/72.7/61.5.
I am east of Knoxville and usually rain is not a problem. A big thunder storm to the south and west will knock me out for a short time, no more than 5 to 10 minutes, usually not that long.