A pilot departed UGN and entered a TFR which had changed positions relative to previous TFR's in the area and included an area immediately south of UGN. The pilot entered the TFR using previous TFR information which was not current.

Narrative

During personal flight; I inadvertently entered TFR as defined by NOTAM 9/0041. I had earlier reviewed applicable NOTAM and diagram associated with TFR; but misinterpreted outer limits of protected area. At approximately XA:15; I departed UGN and flew south for personal flight during sunset as I have in the past cruising at 2200 FT MSL. Unlike past TFR's for the Chicago area that restricted airspace over central Chicago area; and centered on Chicago; the July TFR limited airspace to edge of UGN. I had reviewed the TFR and was aware of the 30 NM radius and elevation limit of ground to 17;999 FT MSL limits; but based on my understanding of earlier NOTAMS (i.e.; 9/5583 and 9/4875) for the area; I had believed the July 23 NOTAM would also allow some margin south of UGN. I had expected; based on the past NOTAM layouts for the Chicago area and use of language indicating this those earlier NOTAMS were 'recurring'; I anticipated that the northern TFR limit on the 23rd would be 8 to 10 miles south of UGN. Also; text information I reviewed prior to the flight about the NOTAM did not include UGN as an affected airport. This incursion was discussed with FAA after returning to UGN. If TFR is to be 'recurring' event for a certain area; it is recommended that the TFR limits relative to the radius; center point; elevations; etc; remain unchanged to avoid misunderstandings and inadvertent incursions.