@Jen853
As @Mark39 indicates, Digital Terrestrial Television (DTTV) reception requires an aerial. In a strong signal area (relatively close to a transmitter mast) an indoor antenna might be viable, otherwise a rooftop unit is necessary. Typically once this is connected you'd need to use the television remote control to select DTTV as an input rather than the HDMI port of the Q box, and then tell the set to scan for channels: what you'll actually receive depends on the mast location and the channels it carries, because some repeaters only have PSB service.
Note that although your television set may have a digital satellite television tuner in addition to a DTTV tuner, this usually won't work with a Sky satellite dish that has a standard Q LNB on it.
On a smart television set there are probably apps for one or more of the PSB services which allow live viewing online: if there's the Freeview Play app then many channels should be available that way.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
