Check out that 9" coax https://www.jeffgeerling.com/blog/2022/1-million-watts-rf-how-fm-supertower-works Thanks, Rob Matherly, W0JRM Centerville, Iowa - EN30nr http://w0jrm.robmatherly.com NAQCC #7688, SKCC #29, FISTS #19246, QRP ARCI #16952