nice setup. i like your portable mount...good idea to avoid damaging the roof. too bad my roof is sloped instead.
btw, you might want to try trevor marshall's biquad for the feed instead. it kicks the can's butt in gain and is simple to build.
where did you get the dish? ebay is impractical because the shipping costs too much. i'm thinking of getting one of the cheap grids from
www.aerialix.com to try instead.