I've been listening to my system sparingly as we've had a large amount of lightning storms and find myself turning the system off quite often at the first sound of a storm approaching
the lightning often travels via the neutral or ground (the two are usually connected at the panel). When you throw the switch, you disconnect the line or hot leg and not the neutral or ground. If you unplug, you disconnect all three. Likewise, lightning can travel through your phone or computer lines as well.
All the above is great advice. Also, the satellite dishes can carry spikes and lightning into your receiver, as can FM antennae. I am having an electrician install ground wires and rods for my dishes and antennae, and I unplug the things I don't want destroyed. Even small static discharges can harm delicate electronics.
Grounding antena won't protect from direct hit (even ground rod is problematic). The real purpose for grounding antena is to prevent static electricity build-up caused by the wind that can charge your antena to several kV making it electrically the "tallest" structure in the area. Size of the grounding wire does not matter.
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