The top of Mt St Helena was fun. I did all three peaks, then headed over to Table Rock to round out the day. (By that time it was quite hot, and the hike back from Table Rock was a slog.)
The middle peak of Mt St Helena, which is the high point of Napa County, has a reader board about radiation from an active radar station. This is the KGO doppler radar, and the danger is primarily if you climb up. Still, I didn't spend too long up there!
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