On 11/8/2021 00:58, Robert Downs via Milsurplus wrote: > Obviously the antenna for the AN/ARN-1, which was an early radio altimeter. > AN/ARN-1 became AN/APN-1 ????? The antennas here: > https://www.ebay.com/itm/301119005382 Are the same as the antennas here?: https://www.ibiblio.org/hyperwar/USN/ref/RADTWOA/img/radtwoa-p152.jpg Kurt