Well lets take a look at this for a sec.

We have one person in Ca, another in OK, 2 in PA and one in NC

For Marks benefit, OK would be in the middle at Ken's flying field but if we show up there, I'm gonna have to work very hard to keep Ken from sneaking off with my Ultimate. Now if us east coast folks want to get together we can decide based on the flying fields

Mine is 600 x 100 with about 10 acres of flying space. We do have interference every now. It's easy to deal with so long as you stay away from certain area's. There will be a new one at the end of the month that is the same size but about 40 acres of flying space and no interference issues