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Does the Spring you use, have a GOOD QUALITY braid rising up thru the center of the coil spring?


To determine that, you may have to bolt both ends of the spring for you to be able to torque the spring open (flex it) to show if you have a braid or not.


The braid is to allow RF signal to propagate up thru the path of least resistance - that is supposed to be the braid inside the coil of the spring - it's attached to both the lower and upper ferrule thread mount - the coil just provides length and tensile strength to handle the whipping and whacking that the whip will encounter in everyday use...


Usually with a S/Steel spring - the braid is supposed to be a good quality thick flex braid.


If it's used, then corrosion may have set in and you may not be able to use it...it is broken somewhere internally  and won't be able to keep the SWR low.