Well just though I'd comment on the security thing, even though encrypting the signals in illegal for Civilians, you can always Freq Hop, as long as you stay with in the allotted Freq's that are assigned to Amatuer Radio Op's and as long as you don't stay in the same place, it is VERY hard for any type of EW to grab where your signal is coming from when you cycling 16 Freq's every 0.3 secs............just a thought, not easy to build though.........
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Unless you try something to which you have not already succeeded ~ Then you shall NEVER grow