LinkedIn has a contact response for job recruiters something to the effect of "Request was appropriate, but not at this time" (I don't have any outstanding requests to verify the exact words). Its implication is that the message was correctly targeted by interests, but just not needed right now.
If something like this was added to the advertising voting, it should convey both concepts - that you are interested (i.e. the ad content was well-targeted), but this is not geographically feasible for you.
So I would suggest:
- Interesting, but geographically inappropriate
However, the sidebar ad space is a little too cramped for something that wordy. Perhaps the much less eloquent:
- Interesting, too far away
Edit: Perhaps an even more generic approach would remove the geographic component and replace it with a non-specific "no thanks on this one". The implication is then that the ad was correctly targeted, and other ads similar to this one would welcome, but you would rather not be seeing this particular one any longer.
- Interesting, but no thanks