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If you really want to compare cables / transmission lines, the you have to really look at two things.
Insertion Loss - Which is how much power you get out at the other end compared to how much power you put in, over a fixed distance. (usualy 100ft or 100m)
Return Loss - Is how much power comes out of the end which you put your signal into when the other end is terminated correctly with a dummy load.
The final two properties are physical and financial.
How hard is the coax or transmission line to bend and handle and how much does it cost.
S band multimode waveguide is going to absolutely fantastic for insertion loss and return loss, but it is going to be big and heavy and cost big $$$.
Coax question. I just put up a new Sirio monsoon base antenna with 100’ of rg8u coax testing with myMFJ antenna analyzer shows 1.4 swr at 26.965mhz and a 1.1 at 27.405 mhz . When I checked the ohms it’s steady a 30 ohms across the entire bandwidth.
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