Hoiya
Hope some can advise please. Recently installed a President McKinley with a Thunderpole 5/8 Hi Gain Silver rod mounted on chimney of bungalow. Adjusted the aerial to the marks and got a reading of 1.0 on FM. SWR has since started to fluctuate between 1.0 to 1.8, then decided to check on AM, USB & LSB and the SWR is over 3.5.
I assume to check the SWR is on FM channels 1, 20 & 40 then the other band will follow ?
I'm completely new to this set up so be gentle with me please as it's a tad different from what I had back in the 90's!

