Is there any reason you can't angle iron a platform together and weigh it down enough (without coming through the roof) and straddle a gable peak on a roof if you don't want to put a post in your yard?  I'm trying to get above some obstructions and think the roof will clear me.  Oh, I'm thinking about a 7 foot mesh dish here.  Too, I have a line on a 7 foot solid fiberglass dish, are they lighter than mesh?  Thanks