While preparing for a trip to the green river in utah, I read about chernobyl ants being a hot fly there. So, I tied some on #10 long shank hooks. And did pretty well on them. That was 10 - 15 years ago now, and I really haven't tried them anywhere else.
Although, I have read - and heard - reports from others about having some success with them here in PA.
Should be worth a try I guess