If you contact the Tin-Lee company of Toronto, he can build you a dedicated channel 16 Join-tenna which would have minimal effect on the other channels. His stuff is all custom-made, and custom tuned, and my experience is that he can make pretty much anything that you want, but it WILL be more expensive than buying a Channel Master JoinTenna
http://www.tinlee.com/MATV-Bandstops.php?active=3