This Aluminum Pole consists of 3 parts: base, top and pole (Parts come together, no installation needed).
2 sizes available :
Base compatible with standard VHF antenna mounts.
1"-14 UNS thread (Ø 20 drill to allow wiring).
VHF antenna mount not included. Get your antenna mount on your preferred marine shop depending on your mount need and / or material (plastic, stainless steel):
Top made it to fit Ultrasonic.
M16x 1.5 aluminum male thread (Ø 20 drill to allow wiring).