This is a 440mhz sweep of a comet 146mhz mono band antenna using rg8 coax. Yes I’ll be changing to lmr400 I’ve just been lazy. The sharp sawtooth pattern of purple and the fairly sharp swr pattern is what I’m curious about. Being new to really fooling with the higher frequencies I have to wonder why it looks like that.
Is it the antenna having very narrow usable harmonics?
Is it the coax having a bunch of loss?
Is it common mode currents?
Is it picking up interference in the system?