Look for old dental offices that are closing. They use them and have ones with enough power to do the job. I’ve bought a dipole this way for $100.00 each. New they would be nearer $1,000.00 each. But make sure they work. Put a ball of aluminum foil in them and turn it on. Will bounce that ball all over place place and quickly build up heat. If the ball does not move it is nit working properly even if it sounds like it is. Don’t ask how I know.