ANTENNA
This is a little off the hook ,but it may be what is needed.
If you cut a spiral into a flat sheet of plastic, you can stretch it into a cone shape. The material will bend to form a type of parabolic concentrator. This shape has been used to make solar collectors, directional antennas for both transmitting and receiving signals. The further the stretch the more concentrated and the narrower the area it can scan. May be cool to try an adjustable one to get it tuned to the application. LT
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