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Oscilloscope for your computer that picks up from your sound card input, download and install, this one works.
O'Scope, works off your Audio Card
Sine Wave Generator for your computer, this works with the output of your soundcard, Download and install, this one works.
Sine Wave Generator works off your audio board
KA5WNX came up with this simple antenna calculator, it runs in "Basic" and it is accurate enough to be worth having,
build your own from "diapole" to "Zep" it gives you the complete setup with picture.
After downloading simply hit Antenna...
(channel 20 is entered as 27.205)
KA5WNX's Simple Antenna Calculator

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