I have an older model tower that I bought or someone gave me without identification.  How can I tell which brand it is, and whether it is one of yours?

First, if the tower is constructed of steel, it is definitely not one of our models.  Our towers are constructed out of aluminum and always have been.  Our section lengths have always been 8 foot in length.  So, if the second-hand tower you have is in 10 ft. or other lengths, then it is not a Heights tower.