it's a high-speed DAC, *obviously* it emits radio waves and "faking a cell tower with a VGA adapter" is scaremongering; you can't receive any data so no handset can associate with it. at worst, you could jam a cell tower (FCC will come and kick your ass)https://twitter.com/Viss/status/988503433924624384 …
Not sure, but I think it's possible to make a highly spoof-resistant (not jam-resistant of course) GPS receiver using multiple antennas.
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you can make a spoof-resistant GPS receiver, and you can even make a jam-resistant GPS receiver (within reason), but the issue is that a) most vendors don't bother doing basic sanity checks b) it's impossible to tell just by looking at the device c) shitty chipsets are everywhere
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