Concerning the question of receiving both Denver and Cheyenne stations when they are at full power: I don't think it will be a problem as just about any (decent) antenna should work. Right now, I can get the 1/2 power Fox on 32 with just about anything. Analogs from Lookout are also good. Stuff on Lookout mountain should make it here fine, roughly 68 miles....Cheyenne's channel 5/30 is straight North of us near I-80 and US30 at a distance of 26.5 miles. Both of these give barely line-of-sight to Ft. Collins. Check channel 5 to see how 30 will work. The problem is how many obstructions are in your way.
The real question is: what about the low-power stations that are currently running out of Denver? Out of the 3 stations transmitting from Republic Plaza, only KUSA-DT has been in about 75-80% of the time at my house. Not to give KUSA a big-head, but their signal is the best out of 16, 18, and 35. Nothing at all on 17...So 16 must be running more power or a directional antenna as they out-perform 18 all the time, which is currently the only other station I get. To get these stations I run a Channel Master 3223, which is a 7ft long yagi. Not exactly a small antenna...The RS model VU-120 in the attic just isn't having any luck.
Concerning rotors, I think the RS model and the Channel Master (the same), will work fine for most TV antennas...I run a CM 9515 for a very large antenna array and it's held up to the crazy winds I get here.
Personally I'm just going to use 2 antennas, fixed, 1 pointing North and 1 pointing South, for the time being. Both are at about 20 ft. This will get by until Denver is up and running at full power.
Using 100,000watts.com, channel 11 is using 40 watts of power from what appears to be the channel 27 tower??, So I wouldn't count on this getting this one...I have yet to see anything yet...