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  1. I recently made changes to the antenna, by changing out the soda can for a 16" 3/8" copper tube. And instead of connecting the antenna to ground and holding the amplifier input wire in my hand, I connected the antenna directly to the amp input, and got way better results.
  2. Hello, I built the circuit shown here and was able to generate a tone out of the speaker (with only pitch control), but now I want to implement volume control, via an antenna (another soda can?). Would it be as simple as adding another VFO,FFO, Weighted Summer, and Envelope Detector and connecting it to a voltage controlled amplifier? (picture shown below) The linked article says it wouldn't be too hard to implement volume control. What did the author have in mind? Thank you!