[Scan-DC] What is the purpose of this sensor or antenna?

[Blair Thompson]

The boxes I've seen are in the stations. They might be in the tunnels too. I wouldn't know.

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On Sun, 2/17/19, Greg Danes <danesgswolf at gmail.com> wrote:

 Subject: Re: [Scan-DC] What is the purpose of this sensor or antenna?
 To: "Blair Thompson" <b_thom at rocketmail.com>
 Date: Sunday, February 17, 2019, 6:01 PM
 
 Blair,Could the box be some sort
 of first responder extender or repeater since they are in
 tunnels?
 KJ4DGE