Very likely they are there more often than you know, perhaps after dark. Anything you do in the area may affect when they go there, perhaps negatively!!! I'd suggest instead doing it the old fashion way.. HUNT THEM! But maybe using some newer tools.

1. Get a couple trail cams to try and pattern when they are in that location.
2. Get a hunt recorder to record all of the conditions under which you see these deer in that location:
http://www.huntrecorder.com/ (Zano is a great guy!)
3. Find out WHY they go there. Cover? Food? Does?

Put all that together and perhaps by next season you will be able to predict when you'll see them there!