As you are dealing with an inverted L and  the lengths you are using are about 1/4 wave on 160M for the inverted L.   You should have some inductance in series at the feed point to bring it close to resonance on 160M.    Ground loss in the system will only add to radiation resistance and make the antenna appear more like a dummy load.  Thus no indicated resonance.   The better the ground system, the sharper the antenna or higher Q.

73

Bob, K4TAX



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