The Scantenna is a good antenna. It receives well on all VHF, UHF and 800 MHz bands.
The antenna is made from lightweight aluminum sheets that are bent into tubular elements. This is a very poor way to build an antenna and more likely than not the antenna will get bent during shipping, contruction or installation.
Slight bends will not really affect the performance of the antenna.
I replaced one recently that had been up for about three years. I broke the original while putting up another antenna on the same mast. The replacement that I purchased claims to be "heavy duty," but it is just as flimsy as the original.
I have been told that the Channel Master Monitenna is a similar design, but with tubular aluminum elements that are much stronger. Unfortunately I think the Monitenna is discontinued.