Thinking of building a six meter preamp to test. On the KXV3 antenna in and out jacks, is the preamp put in series with these two jacks? Do you have to press the RX ANT to get the preamp in line? I want to use the preamp with the same antenna as I transmitt on, no separate receive antenna for this application. Cant find much detail in the manual. 73s Jim K4JAF