Currently in my back yard I have a 8 foot high pull up bar, 7 foot high pull up bar,  parallel bars and a 11 foot high bar that I use in my body weight training.  I constructed all of them myself using normal materials purchased at home improvement stores (Lowes, Home Depot)  If you would like to read about how I made them click the links below.

Other than some unavoidable minor warping, all of my equipment has been holding up well in the brutal South Florida weather conditions for the past couple years.

Pull up Bar

Parallel Bars

High Bar (buried inside another blog post)

7 Foot High Pull Up Bar