Light aircraft pilot on pipeline patrol reports cell phone tower about 200 FT tall that is not on any charts; tower is 4 miles north of LBB just right of the LOC Runway 17R.

Narrative

I was working with LBB Approach inspecting a pipeline running west to east on the north side of their Class C airspace. I had to run a short line to north side of this present line. I had only run this pipe once; 6 months earlier so I wasn't entirely familiar with it. Approach asked me how much longer until I turned back to the south. I said I could start the turn right then and was approved. I started a turn to the west to avoid the strong west winds blowing me way off course. Neither my sectional or current GPS unit showed any towers in that area. As I came around the turn there it was. I had enough vertical clearance so I didn't take any evasive action; however the wind pushed my track right over the top; which I didn't expect. Poor clearing before I started my turn caused this whole problem; trying to accommodate Approach without looking first created a hazard that I should know better than to let happen. My chart and GPS have been marked to prevent this tower from sneaking up on me again; and I will always clear the area before I start a turn in the future.