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Make a cut in the outer tube so a hose clamp can be used to squeeze the inner tube. Use anti seize that has metal in it between the tubes to seal out moisture and improve conductivity.
I now have the SY27-4
It required cutting all the elements with a hacksaw.
It was pretty straightforward and simple. I bought a metric tape measure to make all the measurements.
I cut mine for 27.500
It works great.
Coax question. I just put up a new Sirio monsoon base antenna with 100’ of rg8u coax testing with myMFJ antenna analyzer shows 1.4 swr at 26.965mhz and a 1.1 at 27.405 mhz . When I checked the ohms it’s steady a 30 ohms across the entire bandwidth.
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