Different countries use different technologies (and sometimes different frequencies) for their TV transmissions. It appears that you're using a set designed for UK's Freeview system, which is unlike the digital TV systems of many other countries.
Hence your TV set can't receive local transmissions in its native state. However the PVT has it's own internal tuner which is capable of doing the 'receiving' part of the job, with your TV set then functioning simply asa monitor to display the output from your PVR.