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Good frame design. Not sure how its shape would differ from the standard circular shaped coil in respect to loading characteristics, or if the frame structure itself would affect the coil’s properties…which it probably will.
The wood of that frame for the coil most likely would affect the coil’s properties much like how a nearby tree limb swaying in the wind would affect a coil or antenna’s resonant properties.
And there is the consideration of the wood changing its properties by temperature, moisture and such.
To me it looks more like a mini-tower than a coil form! Just make sure you put on your climber’s belt first before attempting to replace the beacon!
Pretty cool though Carl.