The exact locations and routings are usually chosen on the day, depending on weather and what particular training patterns are required. That call willl usually be made at about 0700Z, hence the generalised and vague area in the advance NOTAM.
In addition to ourselves, the average pilot, remember that air traffickers will also be interested in advance notice of this sort of thing. At least when it all kicks off. they'll know what they're looking at and have some idea how long it will last. They can pass this sort of information to you and I when pootling towards the 40+ aircraft.
The reason why AEW, AAR and Jamming are mentioned is their effect on air traffic services.
Aircraft under AEW control cannot be coordinated; they have difficulty stretching the landline to a B707 at 30,000'!
Most AAR takes place around 20,000' and usually somewhere close to the Advisory Routes over Scotland. AAR is tricky from the control side of things, as the formations are unwieldy and diffcult to manoeuvre at close ranges.
Exercise jamming only affects specified UHF frequencies and military radars. While this doesn't affect you directly, the fast jets may not be receiving full traffic information, and the fighter controllers may not be seeing all traffic - personnally I'd stay away, having seen it from both sides!
At least if you up there and talking to air traffic, mention Clean Hunter and they should be able to tell you where it is at any given time.
Hope that helps
AA