Here's a closer view of the top of the Bonneville tower, with the eight-bay main and four-bay backup antennas, both ERI SHPX models. The main antenna is used by both KPKX (98.7C Phoenix, the original station here) and KTAR-FM (92.3C Glendale), and it is slightly beam-tilted. I don't know if the aux antenna is also used by both stations, but it would seem reasonable.
Copyright 2009, Garrett Wollman. All rights reserved. Photograph taken 2009-04-16.