I was just wondering how close you can get to the runway at your local airport. Here in Ostend (Belgium) I can get as close as 20 m (about 60 ft) to the runway. This spot is situated about 500 m (1500 ft) from the runway treshold and really great for taking pictures, the fence is only 5 ft high. It is sooooooooo cool to see a B747 taking off from there, or a B707: ear damage guaranteed!
At our national airport of Brussels, things have become worse over the past few years. They constructed a double 8 ft high fence a couple of meters apart from each other (those with the white and red bars, you can see it on some pictures on airliners.net), making it very difficult to take a decent picture of an aircraft on the ground.
At this moment, they are working on walls of soil to reflect the noise so in a while there will be even less viewing opportunities.