On some models a poor connection in the radio antenna harness and sub harness can cause static when going over bumps. Replacing the antenna harness and sub harness will commonly repair this problem.
Car Problem Reports
Honda Ridgeline Poor Connection in Antenna Harness May Cause Static When Going Over Bumps
Honda Ridgeline Problem
Average Mileage: 81,250 mi (25,000 mi - 180,000 mi)