[agumonkey]

I remember reading that unless you amplify the radio above 5W or something, there's no way you're above the regulated limit.

[colanderman]

4 W (36 dBm), and the 8.5 dBi gain of this homemade Yagi puts you over that if you're operating at 1 W (30 dBm) max transmit power (as some home routers do).