Verizon is losing their cell tower closest to the ballpark and looking for space for short term and permanent replacements. Why not put up the tower on top of the Bud Light Loft? They could wrap it with a sign for whoever they get as the new naming sponsor for the ballpark and use it to hang the World Series banners.
http://www.bizjournals.com/washington/news/2016/11/10/verizon-faces-significant-loss-of-cell-coverage-in.html
Sorry that I'm looking at this right now so many months later, but are you concerned with coverage outside the stadium? Nats park has a dedicated stadium DAS (Distributed Antenna System) that Verizon Wireless is on as is T-Mobile and AT&T. Don't know about Sprint.
