Glomex antennas’ extensions are used for vertical elevation of the antenna in order to clear the reception/transmission field.
They can be made of stainless steel or UV resistant fibreglass, with standard 1″”x14 thread, and they are the ideal complement to all Glomex antennas (VHF, AIS, etc.), NOT FOR GLOMEASY ANTENNAS
RA122/6 is a fibreglass extension, 600 mm/24” high.