Lifetime 1221 Height-Adjustable Portable Basketball Hoop with 44-Inch Backboard. Amazon also offers a "new model" that costs $10 more and has worse reviews.
From Amazon: In the beginning, all the founder of Lifetime Products wanted was a sturdier basketball pole for his backyard. With this in mind, he found and purchased a piece of heavy-duty used pipe, a sheet of plywood, and a basketball rim. The resulting backyard basketball standard functioned perfectly in his backyard. Seeing the potential of his hoop, he placed an ad in the local free classified newspaper and made his first sale. The rest--as they say--is history. He created the American PlayWorld Company in 1973, based out of his garage in Riverdale, Utah. After expanding into several other types of playground equipment, he eventually moved to a bigger location in South Ogden, Utah. Several years later, the company transformed the basketball industry by introducing the Quick Adjust basketball pole, the first complete basketball system you could raise and lower with a broomstick. In 1986, American PlayWorld created Lifetime Products, a separate company intended to concentrate specifically on manufacturing adjustable basketball systems.