[bitterohiogunclinger]

Using such a remote control would be pretty “risky” in the sense of premature detonation due to the presence of other radio signals in the area.

[Repeal The 17th]

I doubt they were smart enough to even think about stray signals.
But at some point in the process
...(think of the pictures of them in the area, dropping the back packs, and walking away)...
they had to pause long enough to trigger the detonations.

[steve86]

"Using such a remote control would be pretty “risky” in the sense of premature detonation due to the presence of other radio signals in the area."

I thought the receiver was identified as a 2.4 Ghz unit from a hobby-grade R/C helicopter (I own similar). If so, the DSM-X or DSM-2 receiver is bound to a particular transmitter and is almost invulnerable to common modes of interference or jamming.

Just How Good is DSMX? In multiple tests, 100 DSMX systems were operated simultaneously for extended periods of time. During these tests each of the 100 systems was monitored in flight and on the ground. In every test not a single case of RF link loss, latency increase or control degradation was experienced or recorded.