But my relatives complain of lack of good PQ and signal levelThat's good, see cheap price, Rs 220 in ur area and they get all channels.
Such situation is on many parts of the country.That's because in Chennai, there was a lot of issue relating to digitization, DAS, license, etc. ARASU, then SCV, then TCCL, etc. So because of this LCO were confused and replaced STB. Chennai has now stabilized.