All of the photos were taken by us. It's hard to photograph white on white. The last two photos were taken against a darker background. Hope that is helpful! Please examine photos and let us know if you have questions.
We recently acquired some surplus parts from an aircraft supply and parts business. This is one of those parts. It has been in storage.
Description from Aircraft Spruce:
The AV-569 is a Boat Type Marker Beacon antenna designed for very low drag. It is constructed of an acrylonitrile-styrene-acrylic (ASA) shell with the internal parts encapsulated in rigid urethane foam for mechanical and electrical stability. The white color allows maximum performance without losses due to color pigments or unseen dirt. It is supplied with cellular neoprene mounting pad and hardware. The antenna is designed to operate at speeds up to 350 mph and altitudes up to 50,000 ft. It has a drag force of 0.20 lb @ 250 mph.