Telugu Desam president N. Chandrababu Naidu has written a letter to Information and Broadcasting Minister Manish Tiwari seeking extension of deadline for installation of set top boxes for TVs till June 30 as many of the households have not yet procured them. More than 50 per cent of the households did not view television programmes in Hyderabad in view of the implementation of the present deadline which expired on March 31, he said. -Special Correspondent