I've got a little handheld. Its great for my uses, which is leading a line of Jeeps out in the desert. There's little to no interference, but they only carry reliably for the line of 50 or so jeeps. Those are generally right together, and if a gap opens, we've got to relay the messages back toward the tail-gunner. To say range is limited is an understatement.
But about 5 years ago we had a separate incident that was very impressive. A buddy was with us up on Copper ridge. It was up past Canyonlands Airport and from our mountain top we could easily see I 70. Another of our group of friends was up busting snow trying to get to the top of Geyser Pass in the LaSal mountains. So our buddy could see the mountain (how could you miss, its a darn mountain/Haystack). So he grabbed his little handheld. Its about the size of 1/3rd of a CB handheld. And he gave his call letters and bang, back came the response. I think they called it simplex or something, not using a repeater. So maybe 40 miles of clean cool dry air. Yes, it was ham radio. But still very impressive in how far it worked. They couldn't talk about anything else for a couple of days. Strong signal. These are retired Air Force officers, not nurds living in their mothers basement. I just assume that to impress them, its got to be special.
So one of the morals to the story is call from a high place to another high place. And make the contact where there's nearly no one else around. Less electronic noise.
Now for the OP...if you've already got the handheld, get a buddy or two and got out to test the idea. Start with clear conditions, only a fool would go testing in rain. Just talk to the other guy as he (or you) drive away. You'll learn soon enough.