Window screen is the best to keep the bugs out of the radiator. After you pass through an area of love bugs it is a good idea to check the screen so that you do not restrict air flow to your radiator. Keep an eye on your temperature gauge since any increase in temperature will be due to air restrictions, and NOT hill climbing.
Try to do your travels early in the morning before the little buggers wake up.
The cooking spray "PAM" works well to keep the bugs from sticking to your paint