[Scan-DC] What antenna is this?

[Andrew Leyden]

Spotted this vehicle and antenna assembly on the Mall near the MLK Memorial. A second one has been installed across from American History Museum. Big AT&T logo on the vehicle but not your standard looking cell tower. (My AT&T phone only had 2 bars next to it). 

Can’t possibly be a permanent mall addition.  Fencing and temporary roads next to each and the whole assembly is on a truck trailer.  Any ideas? 5G testing? Temporary service for some recent event?

https://www.flickr.com/photos/penguinsix/shares/X3UPK2

Sent from my iPhone