Let me see if I can simplify this furthur. A 1/2 wavelngth of coax is not required-if the Z0 of the feedline is the same as the Zin of the transceiver. In this case, there is NO SWR transformation going on, no matter what the feedline length. Only when the Z0 of the feedline and the Zin of the transceiver are different will there be a SWR transformation. Pat W0OPW