Here are a links to possible hardware for performing chimney mounts:

http://www.ebay.com/itm/Satellite-Dish-Chimney-Mount-Kit-for-18-24-and-J-Pipes/330863223053?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

http://www.ebay.com/itm/Antennas-Direct-STM-1000-Direct-40-Universal-J-Mount/301380816257?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

http://www.ebay.com/itm/DS-3000-J-Pipe-Mount-Roof-Mast-for-Satellite-Dish-TV-Antenna-1-66-Inch-OD-DS3000/370452266457?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

-grant