Back in 1974 I bought a
Modar VHF. At a cost of $1200. It was excellent. I didn't realize how excellent it was until a few years later when I bought my next boat and installed a
Standard Horizon which cost about $275. You get what you pay for.
At the time, the range for a VHF with a wire antenna on a 35 foot mast was about 30-35 miles on "High Power" (@25 Watts.) The
Modar had a range of about 40 miles with excellent reception. The Standard Horizon (eight years later) had a range of about 25-30 miles..with marginal reception quality. Just my experience...

NB
EDIT: Those figures are for open ocean with no mountains in between.
YES, I do have some experience. As one of my fellow forum members recently said..I know
everything: