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Hum - did you find any particular modifications that are useful for 3 and 4G? I am making multiple of them, so not too picky about getting both frequencies to be detectable by one antenna. Thanks for the help!!
Very cool project! If I wanted to add an LED to the system so it went off when radio waves were being received by the antenna what would you all suggest??? Don't need to actually boost 3/4G radio waves - just detect if/when they are there. HMU in a comment if you got some ideas!