Whether you have it tweaked or not, antenna design, placement and tune is probably the one thing that will net you improved performance under just about any conditions.
To paraphrase the old car adage, there's no substitute for cubic inches, but gettin' the power to the ground is just as important.
One of the best performing radios I ever had was a nice little Radio Shack hand-held with a separate battery compartment and a removable antenna. I could swap between standard and rechargeable batteries, but better still, I could remove the battery compartment altogether, plug the unit into the truck's power, attach an external Wilson 1000 magnetic mount base load antenna, and go like gangbusters. The radio was so small at that point, that the whole thing would fit right into the ashtray or cup holder on the dash, and still put out like a big dog.
I'm pretty sure that the location, tune and type of antenna had more to do with it than anything else.
Most of the time, I was the only one in the group that could hear everybody else, and they could all hear me, so I always had to relay conversations to all parties.
Kept me busy, but in a good way. Felt involved and all that %). Contributor status without the title, so to speak. Whatever, but it was good to be able to keep in touch with the whole group.
Paul