Thanks for the clarification that the term GME is a trademark or branding of a product sold
. I was completely unaware of that brand. I do not believe it has any market presence in the USA.
To learn more about the antenna, I followed the link given above. The product illustration showing the antenna was a very small image that revealed nothing in particular about a solution to water intrusion.
Regarding water intrusion into antennas that employ a metal whip: I used a GAM SS-2 antenna for more than ten years. Later I had occasion to disassemble the antenna base to examine its insides. I found no sign of water intrusion into the antenna base nor any sign of corrosion
in the UHF-series jack connector at the base.
On that basis, I do not think that the GME antenna holds a unique position regarding how it prevents water from contaminating its internal components or its external UHF-series jack connector.