I believe I should be able to get a number of Denver OTA broadcast channels from my location but I'm not sure what type of antenna I should install.  I'm primarily intestested in the major networks and the PBS channels offered in Denver.  My TV fool report:
 
http://www.tvfool.com/?option=com_wr...c77a3e14b960a1
I'm terminating service from Dish Network and I don't think their yard mast will be of any use to me.  I plan to install an outdoor antenna in my attic with a short (15') drop to a single HDTV.  I estimate the antenna would be about 15' off ground level as well.  My house siding is wood composite lap siding and my shingles are asphalt construction.  While I don't have any nearby trees, my neighbor's home (single story) may block some signal for me.  I know I should consider a roof mounted antenna but there aren't any of those in my neighborhood and I have to respect that.  
I'd certainly appreciate any advice you can give me and I'm grateful that this site is there to help folks like me.  Bob