You’re exactly right. And I’ve tested a variety of things in a variety of environments, on a variety of LOS frequency ranges. The lower decibel rated antennas round out the radiation pattern in such a way that a 30ft elevation change a mile up the road doesn’t just choke out a signal.
Conversely, on a wide open flat plane, the higher decibel gain antennas “put the thumb over the garden hose” a bit for a little bit more punchy audio.
It’s been my experience that, all things considered, it’s just never worthwhile to take that 2.3-3db gain off of the car in favor of the 6+. Because guess what,.. in that wide open plane, that lower gain antenna gets out as well. So why not just roll with something that gives you the best chance of WORKING all of the time? To not prioritize that over being able to “sometimes have punchier audio” seems silly.
So everything considered, and just generally speaking,… The lower gain mobile overall just works better . Only if you’re just an absolute turbo-nerd about sounding the absolute best in modulation does it make it worth it to unscrew and rescrew something different. Or you want to be able to step over someone. You’re just as readable and intelligible on the lower power.
Claims ERP or wattage being the difference of hitting a repeater or being heard by a station, on UHF, given the exact same conditions and terrain, are a fallacy..
I genuinely think many people simply don’t understand this about antennas, and always assume to buy the highest gain mobile antenna possible.
Yes, for your base that you have up high on a pole, get the gain. Not mobile though…