Randy came and picked me up and we flew to Auburn, where we met Vic, Tony, Stacey and John (who'd driven up from Walnut Creek) for brunch.
My radio worked just fine, but interestingly Randy said it hadn't been cutting out, rather it was getting distorted. I'll have to investigate the resistance in the switch now.
After brunch, we wandered back. It was turbulent in places, so I can only guess that Tony and Stacey were having less fun in the Legend Cub.