Originally Posted by Hoohaa
We have checked it using a multi meter and hooked up a whip to it which worked perfectly. So we can confirm there is a short somewhere.
You cannot measure an antenna
with a multi meter. Most antennas (the good ones) show a short. That is because there is an induction that shorts it for DC. For VHF
signals that induction is not a short but a high resistance. But replacing it for a full size antenna would be a good idea anyway.
If you want to check your cable for shorts, disconnect it at both ends first. Other than that you need specialized equipment
like an SWR meter to say anything sensible about the antenna installation
. A good indicator is the colour of the copper inside the cable (cut a short piece off). If it is black the cable is gone and should have been replaced a few years ago. If it is green, it should have been replaced a decade or more ago.
Instead of RG213 try a modern low loss cable like, for example, H155. It has similar loss characteristics as RG213 but has the same diameter as an RG58.
At the same time it is more rugged than aircell and other hollow cable types. Tremoflex would be the low loss solution for professionals but that may be a little overkill for yachts.