TV antenna mounting kits were sold for a long time around here that specifically were made to mount on brick/masonry chimneys.  They look (from memory) like what you have in the pic; metal 'corner' pcs and banding with a means to tighten.
As they were readily sold with 'old style' TV antennas, they must have been 'legal/approved' once upon a time.  As TV antennas; the 1-1 1/4" pipe with the array of rods have become rare, cable a nd dishes are the norm.  
That said, I'll have to keep an eye on the dishes, and look if there are any antenna kits still around.
Edit:
Second look at the pic....sure looks like that's the design intent of the installed mount; now the packaging/mfg instructions come to play.  Domestic mfg or China??
Monday/Tuesday, I'll ask one of the Building AHJ's about this.
Last edited by HotLine1; 07/04/09 12:38 PM.