Hi Mayo, I think I can say welcome, I"ve been here for a little while. About the dish on the 25 foot pole, it would be ok, depending on how rigid the pole is, also, if you wanted to do modifications to the dish, or just maybe touch up the alignment once in a while, 25 feet in the air might pose some problems as compared to a ground mounted dish, or side of the house mounted dish. It would never work for me because I am always changing something on it, besides I'm scared of heights
but thats me
Also, if the dish is up high and out in the open it will be at the mercy of the wind, so your signal may be erratic on windy days.