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Unless you can guarantee your antenna is truly balanced you'll have common mode on the coax. How much is anyone's guess and it may or may not be a problem.


I would say given your situation just to keep an eye on things and if you start experiencing TVI or RF on your audio to put one in.


5 turns of RG213 or RG58 on a 4.25" diameter former is what you need and should give you 8k Ohm choking impedance on 26-28MHz.