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making an antenna

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friedthat

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I was wondering; i have an old ducky that i took apart (unwound and ripped the plastic rubber off of it. Now if i want to make this long vertical wire for a specific band i.e 400-430Mhz should i use quarter wave calculation or half wave to cut it to length?
 

friedthat

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so why would one be better at half wave and the other be better at 1/4 wave? ALSO what about distance. if the site is farther away i.e 20 miles or so which wavelength should i go with 1/2 1/4 or 5/8?
 
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Don_Burke

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friedthat said:
so why would one be better at half wave and the other be better at 1/4 wave? ALSO what about distance. if the site is farther away i.e 20 miles or so which wavelength should i go with 1/2 1/4 or 5/8?
A coaxial antenna is two quarter wave elements that make up a half wave antenna.

For 20 miles, I would forget the duck and put something outside.
 
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