:roll: You can find them Nowhere untill you plan to make one for your self or if ready to submit the paper work for the licenced band you own .Illegally you have got plenty of ways to make them why only 4W
you can make 20W after adding plenty of POWER almplification stages and Big heat sinks ,,,,, Hope you will not do the same with the POLICE or MILITARY allocated wireless space and if you do you wont come to elektroda any more :wink: