What's with the Blimps?

I saw the Metlife blimp over Frederick today, so I took a picture of it. 

 It wasn't a great photo. It was a little too far away. I also took a photo of the MetLife blimp three weeks ago, when it passed even closer to my house. This one was taken as the sun was setting. I might of gotten a better shot, if there was more light.

I got a nice shot of the blimp last year. It is just the blimp against a blue sky. I would like something else in the frame to give it some sense of scale.

When I lived in Pittsburgh we saw blimps regularly for football games, but I have no idea why I see blimps so often in Frederick.