Everyone is focused more so on getting something in the base on their own...why not use the things already allowed to go in? For example...the bus.
There is a bus that goes into the base, correct? Well, find out where it gets loaded up at, walk by and slap a small sticky camera on it, and you'll
be semi-set.
Or somehow disguise yourself as some contest give-away guy and give one of the Area 51 workers a brand new laptop with some pre-installed program set
to use the webcam every couple seconds and send them somewhere else. Although I imagine the government would force the workers to use Area 51
computers...hell, make a little virus on their home PC that will transfer itself onto a thumbdrive or something which they might take into Area 51
trained to use the webcam or something.