Hmmm ?? A construction project!! Or, is it a recipe?
Start with a 48 inch length of stainless steel 1/16 inch diameter rod.
Add a new coil at one end to be tapped for a 50 ohm match at 146 MHz.
Add a new capacitor connected in parallel with the coil.
Adjust capacitor and inductance to achieve 146 MHz resonance.
Using an antenna analyzer locate and solder a tap coil for 50 ohm match.
Seal all with a strong weather proof sealant.
Install in mount provided at point of sale.
Install on vehicle.
After failure, replace with commercial 146 MHz antenna
Deacon Dave, W1MCE
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