The signal from KHKI, 97.3 FM is a likely source of interference to real CH-16, KDSM. The fifth harmonic of 97.3 Mhz is 486.5 MHz... right smack in the middle of real CH-16 (482 to 488 MHz).
While I said the CM-3010 is good, I think a bit larger antenna with more gain and directivity would be better.
You may well find that you need an FM trap between the antenna and all TV tuners. I'm still not entirely clear how many tuner inputs will be connected and if the Hauppauge with FM capability has a separate FM input or not. However, a generic method of distributing TV+FM on one coax in this situation is as follows... If the FM tuner input(s) are separate, you can cable from the antenna to a 2-way splitter. One output will feed the FM tuner(s) and the other, an FM trap. From the output of the FM trap you then feed the TV tuner(s). This arrangement adds loss to the system... a reason to consider using a larger antenna to start with. Ideally you'll avoid using any amplifier.
http://www.radioshack.com/product/in...LA&cagpspn=pla
http://www.antennasdirect.com/store/...on_filter.html
Can you consider installing an FM antenna in the attic, and then running a new coax to the FM receiver?