I'm interested in adding a GaAsFET preamp at the mast for a weak signal 2m yagi. The location of a new tower requires a run of 165' of LDF4-50. I was looking at the Advanced Receiver Research, MSP144VDG-160 mainly because the description leads me to believe that it is RF switched. The plan would be to power the unit by injecting the supply voltage onto the Heliax via bias-T's. Does anyone use this brand of preamp or can you make any other recommendations based on your experience with them?