I would also suggest getting the ICE protectors (http://www.iceradioproducts.com/
). I've had them on my HF and VHF antennas for a few years now and never had an issue.
Their main purpose is to protect your equipment from static electricity generated by blowing dust and precipitation rubbing against your antennas. One always wonders if these devices really work, well I can tell you they do. I live in southern New Mexico, and about a month ago we had an afternoon shower. It happens that I just finished working on my 75M dipole when the shower came. I picked up all my tools from the yard and reached over to plug the PL-259 back into my antenna switch box when ZAP, I got a pretty strong static discharge into my hand. I dropped the connector to the ground from the surprise. It took me a few seconds to realize what happened, and I grabbed the connector again figuring I discharged all the static between my grabbing it and it hitting the ground. Well, I was wrong, ZAP again! Not wanting to be the guy who touches a hot burner and says, "ouch that's hot", then repeats, I grabbed the coax, touched the connector to the base of my tower and quickly plugged it in.
So the moral of the story is I run a Ten-Tec Jupiter as my main rig. It's an SDR and notorious for RF/Static issues causing it to act strangely. I have never had a problem while using the ICE protectors. With that said, any grade of protection is good, but have a look at the ICE website, read some of the tech documents and their theory of operation and make your own decision.