Another possibility is a British or Irish bar, most of which has Sky and Setanta satellite channels. American football is carried live on both platforms, College Football on Setanta, NFL on Sky Sports.

And you have the advantage of English (American) commentaries, rather than German!

Lol, you really think there would be german commentaries on NASN? :D :D
Of course all those broadcasts are English only. (As is the whole station)

Sky isn't available legally for copyright reasons, but some places have viewing cards imported from the UK.

NASN has broadcasting right for NFL on the continental Europe, but Sky has in UK and Ireland.