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So I have 2 meters in line. The meters location isnt the issue I dont think.

As mentioned previously I have both antennas to a 2 way switch then into the "system". One antenna on same system works fine with power on. One doesnt.

Swapped coax runs between antennas and problem stayed with the Maco. Therefore the  coax runs aren't responsible for the problem.

Likewise the "system" works fine on both antennas at low power.

Only the Maco reacts extemely badly to application of power.

Even tried various amps to same result so the amp isnt the fault.

Properly confused with this antenna.

Also chokes and low pass filters have no impact on the condition

At this point I'm going to completely tear the station down and reassemble.

Nothing to lose.