Bryant,
You may be correct, but you still have to receive the signal. Go out to your truck, and unscrew the antenna from the cowl. Now see what kind of reception you get when you turn the radio on. I don't fully understand how the gain can effect the reception, and I may find that it does not have any effect at all, I should know something in two days though.
Something else to think about. If you are having trouble receiving signal on your television, you go out and buy an amplified antenna. Your tv is the receiver, yet you still amplify that antenna

Why wouldn't the same apply to low level frequencies, that are used in MURS and VHF?
All of this is over my head but hoping you come up with something on this. I would think if the long range antenna doubles the range of the rubber antenna....hopefully a correctly tuned gain on a longer range antenna can be found.