I have a tested Low noise high powered switching preamp for sale. >From a friends estate SSB Electronics Model SP-2000 for 144 mhz Works and switches well I would like 300.00 plus 15.00 shipping Pictures upon request You need a sequencer to drop 12 volts first when you go into transmit. I can also be reached at 570 829-2695 Thanks Herb K2LNS