Buy a short, inexpensive coax cable. Be sure it is for VHF transceivers, not for cable TV. They are not the same. Since you bought an antenna, hook it up to the new feedline and unplug the existing antenna. Plug in the new one. Depending upon the antenna type, it may need to be mounted to work perfectly, but if there is a problem with the existing antenna or feedline then you should see a dramatic improvement even if the new antenna is just propped up in your cockpit. There will probably be no change in the voltage drop.
If there is no improvement, plug the original antenna feedline back in. Run some nice heavy 10 gauge cable directly from your battery to your VHF radio. Try again. Make sure the connections are tight at the battery end and the radio end. This time also check the voltage drop. If the problem goes away, then you have a electrical wiring problem. Start tracking it down. If you tell me the length of the wire run I can tell you the minimum wire gauge you should use.
The important part here is, change one thing at a time. otherwise, you won't know which change fixed the problem.
If none of this works, call Icom. You may have a bad final amp in the radio. A three year old radio should not be easily damaged by bad SWR, but even the best equipment can fail.
Scampi 30 MK-IV
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