Aaaand, nope. -50 on all, no change. Icon goes out at 39 feet, 3D toggle switch works down to about 48-49 feet, radar shuts off when a wave breaks over the antenna.
So back to square one, the scientific method - restore the original file, run a control test to get a benchmark to see what the original unmodified program does - which is exactly the same thing, hand icon goes dark at 39 feet, on/off switch works until the antenna is submerged.
So good theory on the MinSensorHeight, but it fails MythBusters testing.