It would be helpful to know what the units of measurement are on the
   side. If they are amps it would indicate that the boxes are
   transmitting a signal, rather than listening. Can you tell from the
   video?
   Were the lights flashing? Interesting that only one is illuminated in
   this photo.

   On Thu, Mar 19, 2015 at 5:23 AM, Alfie John <[1]alfiej@fastmail.fm>
   wrote:

     Hi everyone,
     We had someone loitering near our front office door today. The
     conversation went like this:
       Me: What are you doing?
       Him: Nothing
       Me: Where are you from?
       Him: A company
       Me: Do you work for Google (he was wearing a Google t-shirt)?
       Him: No
       Me: Who do you work for?
       Him: Leidos
     He had a device hidden near the stairwell door:
       [2]https://www.alfie.wtf/photos/wispy.jpg
     Sorry for the low quality image. It was taken from a capture of a
     video. I've got the video at work but would rather not release it as
     yet because it has his face on it.
     The diameter of the antenna base was around 2cm and the height
     of the antenna was around 15cm.
     Someone on Reddit said that it looked like a jammer. After going to
     Google Images and searching for the following, it looks like he's on
     the
     right track:
       - "GSM detector"
       - "GSM jammer"
       - "GPS detector"
       - "GPS jammer"
     If anyone has info on what this device could be or where I could go
     to
     get more info, that would be much appreciated.
     Alfie
     --
       Alfie John
       [3]alfiej@fastmail.fm

References

   1. mailto:alfiej@fastmail.fm
   2. https://www.alfie.wtf/photos/wispy.jpg
   3. mailto:alfiej@fastmail.fm