In Europe there are many different ways to mount a mobile antenna. The magmount with a PL connection (UHF-Female or SO-239 on magnet) and a whip with a UHF-Male (PL-259) are common for CB and low frequency use.
In the USA most whips have a 3/8×24 thread, this is also common in the United Kingdom but not on the European continent. But CB and HAM operators love certain USA brands, so it is handy to have an adapter that allows the use of a 3/8×24 threaded whip on a PL-(Mag)Mount.
When the whips are long there is a huge force on the mount, so the best you can do is use a Heavy Duty adapter to prevent damage to your antenna or mount. The RoadPro adaptor is a heavy duty adapter that we consider the best solution on the market.
To find the product on our Avera-Distributing website use this link: https://www.avera.eu/roadpro-uhf-male-3-8×24-female-hd.html
We stock many different adapters, if you can not find a certain model on the website, feel free to email or phone us.