For a dipole (or flat top as some call 'em) that is fed in the center of which the impedance is NOT a true 52 ohms... can some one advise the construction details of a coaxial balun (a balun made of coaxial cable) to get a good match at the feed point and with the entire antenna being fed with 52 ohm coax (LMR-400)? Tnx & Happy New Year to all! Paul - K4BET