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      -Don't do this
      -Foam mold
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It is important not to coat your payload in anything aluminum when you have your GPS.  The foil will interfere with your reception possibly causing the GPS to lose signal.  It will definitely weaken the signal.  If you need a radar reflector use a payload that doesn't use antennas or make a large empty box and coat it in foil.

This is the outside view of our main communication/location payload.  Outside you see our GPS 35 and our aluminum foil reflective coating.  Inside is the battery for the GPS, a kenwood TH-D7 radio, and our HotHands hand warmer.  The lid goes on top and then we rap some duct tape around it to close it up tight.  Make sure to cut a hole for the kenwood antenna to stick out the bottom.