The receiver doesn't have an ATSC or QAM tuner. The antenna must be connected to the TV and then use the TV setup to scan for available stations. Connect an optical digital cable from the TV's digital out to any optical in on the receiver and assign that digital input to whichever input selector you want to use when listening to TV.
Many TVs will send DD 5.1 thru its optical digital output if the signal originated from the TV's internal tuner but some will downmix it to 2 channel PCM. If the TV only outputs 2 channel PCM then you'd have to use a matrix decoder, such as PLII, to turn it into surround sound.