Ground Strap vs. Ground Cable

I have an arch style building that is a great Farady cage. It is so good the garage door remote would only work at 2 feet when the door was shut. I solved the problem by making a passive antenna repeater out of a brass welding rod, one half in, one half out, thru a nylon bushing. It increased the distance to 30 feet, I can now open the door from inside the car.

Boxes for electronics does not shield electronics much, I/O cables are antennas bringing in, or radiate all sorts of signals. Cable chokes at entry are a must. I use surface mount chip inductors, and caps on all I/O of automotive ECU designs.

So to get the door remote to work, it is a good example of an I/O without choke. The rod lenght was cut for the correct wavelength.