cut the tape measurement long the centre line into two halves. The length is about 50 cm and the cube sat manual antenna deployment. It will become mcu control when I found the "nichrome wire". The tape measurement is $3. The center piece is a heat sink which you should not use. This is a demonstration only , becareful shape edges will cut finger and eyes.
dipole antenna is 70 cm
wave length is lambda /4
6 mm in width
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