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The dish is grounded, though I may put a bigger ground rod on it. Is there anything else I can do to protect it -- and the equipment it's plugged into, and the house it's sitting on? :)
Aside from commercial surge protectors, I'd be inclined to make my own home-brew arrestor too. I read of a person having problems with faxes getting blown by phone-line surges, even with a commercial lightning arrestor. He added fractional-amp fuses inline with the phone. After a lightning storm, he found the fuses blown, but after replacement the fax worked. No word on how well paired high-bandwidth applications handle a modification like this, but this should inspire the tinkerers among us.
You can buy a special connector that accepts two male RG6 connectors, and has a ground screw.
Actually, what you want is a "lightning arrestor". It may just look like a connector with a ground screw, but there is (or should be) a chamber inside with an airgap between the signal line and the ground. This allows any surge to cross the gap to ground.
I assume a wide variety of these are available for satellite dishes. I don't have a satellite dish, but I do have shortwave and VHF/UHF antennas. I use an Alpha Delta "arc-plug" type arrestor. (The arc-plug is replacable in case of a hit.) These are expensive ($60) but are the Cadillac of lightning arrestors. You will lose .5db at 3gHz , .2@2gHz (probably fine - not sure what the frequency range of the convertor output on your dish is) and only come with "N" connectors, so you would need plug adapters - probably 2 female F to male N - or else install N connectors on your cable.
(It also can come with "UHF" connectors. You DON'T want those, as they are a low-frequency connector design.