Hi:

There is nothing magic about a stock coil. It simply provides inductance.
You can make your own and adjust it until the range is correct. No more
difficult than putting your shoes on.

You do not even need a formula. Just put more wire on than the higher band
and less wire than the lower. Adjust the turns until the output is what it
is supposed to be. On the broadcast band you can even listen to your $2.99
radio and calibrate against local broadcast stations. I recall doing that
when I was about 10 years old.

Colin


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