TV Fool isn't working for me either when I enter my own address. So it sounds like the site itself is having problems. Anyway, looking at the antenna that the OP has, & it's a UHF only antenna, with a transformer that's set to tune out VHF frequencies. The Denver market has 3 VHF-Hi stations: NBC affiliate KUSA on RF 9 (the one that the OP complains can't get), ABC affiliate KMGH-TV, & PBS station KBDI-TV. The Clearstream isn't made to receive those channels, & even if it picks up some of them, results vary. This is why I never recommend these type of antennas for VHF reception (not even the Channelmaster CM4228, Antennacraft U8000, or the Winegard HD8800). I already tried my Antennas Direct DB8 (original DB8) on VHF & that does not pick up a single VHF station. A separate VHF antenna is needed & either the Antennacraft Y5-7-13 or Y10-7-13 is needed (can't recommend one or the other without a signal analysis from TV Fool, which isn't working properly right now).
To the OP, not all TV stations operate in UHF as most people want to believe. If the current FCC administration gets their way, we'll see more stations crammed on VHF & more UHF channels taken away, just so Verizon & AT&T can hog all the wireless spectrum (like they already do with a number of PCS licenses they sit on in many parts of rural America). Channels 52 - 54 & 56 - 69 were taken away to be used for wireless service, primarily by AT&T & Verizon (channel 55 was used for Qualcomm's Media-Flo service, but not sure what was done with that part of the spectrum, since Qualcomm discontinued Media-FLO).