Our new to us ‘87 CHB 42 foot Europa came with zero information in terms of things on board. Can anybody tell me what it is? My best guess is that it’s an antenna of sorts from an old nav system but I’d like to be sure before I remove it. The barrel at the top about 2 inches tall and the same in diameter. What appears to be a stripe about a 1/3 of the way down from the top are 3/16” holes. They go all the way around the “can.” Thanks in advance.