A dude I know has an antenna similar to that ship's radar antenna set up on his balcony. But, smaller and it was shaped like one of those steering wheels used on some riding lawn tractors. He used to find open unencrypted internet connections with it. That way, he never needed one himself. He saved monthly telephone bills with it, also
The ferry Tillikum, leaving Colman Dock, Seattle waterfront. Note the ambulance (Pontiac?) at the head of the pack.