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anybody here use a parabolic grid antenna?

various gain based on the job. Distance, tranmission cable run, power output (if amps used) etc....
What is a specific question you have about grid dish antennas?
 
One of the big signal killers for low power microwave transmissions is water. Not only do leaves, limbs, and branches contain alot of water but anytime it rained and the water would be on the leaves you'd probably run into problems. Not to mention the harmonic distortions as the wind blows. After a very short distance, line of sight means line of sight. You didn't mention how far the link is but if it is more than a couple of hundred feet, and you have multiple trees in the way, you can pretty much forget about a straight shot and start looking for reflector structures for either passive antennas, a bounce, or an active multipoint bridge setup. When you start saying "bunch" when discussing tree obstructions, you can just about start looking at other avenues than 2.4 or 5 Ghz microwave links.

Edit: This is all assuming your talking about 802.11 equipment. Your intial post and reply are so incredibly vague and devoid of useful information, my answers have assumed a large degree of conjecture.
 
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