The connector on the QRP rig (QRPp) is BNC, connector on the antenna is a SO-239. Coax I was wanting to use is LMR-400. Reason being its the same as I will be using on the 23cm rig. Seems like I have one h* of mix here. That is not going to work. LMR-400 is almost 0.5 in in dia. I could pigtail the BNC (insertion loss), but will wait to xmtr gets in and see if I can drill case hole bigger. Coax run ~40 feet. QRP running flat is 250mW. Can go higher with added driver transistors. Lets say I did go with the LMR-400 because of the lower loss at the bandwidths using. If I pigtailed to the transmitter and pigtailed at the antenna, would I still be better off getting rid of the pigtails and going with a smaller dia coax, even though it would have a higher loss? Thoughts on a different coax to use? Never mind i'll calculate myself. thoughts anyway?