Find someone with an SWR meter and get your antenna tuned, or buy one and do it yourself. It's easy.
They cost about $20 for a cheapy.
I had a meter years ago during the CB craze started by C.W. McCall and boosted by Lady Bird Johnson.
He, because of his song Convoy and her, because she jumped to the head of the line for her CB license while the peons had to wait for months to get theirs. The FCC caught so much flak they had to speed up the process.
I still remember my number and I haven't used it in almost 45 years.
My handle was The Speed Demon because I drove a Dodge Demon really, really fast.