i have successively done this 2 year ago, but now bayed multi tv and spending rs 160.
follow the steps below
1) buy a RF or AV cable with suitable length so that u can make connection from STB in one room to TV in other, in my case i used RF cable, bcoz other TV was CRT.
2) buy a good quality cable with 3 wire, like one we generally used for audio cable of Hi-Fi system
3) buy a good quality remote censor
4) open STB from screw on back side.
5) from current remote censor attached to PCB/board of STB, you will find that in front panel of STB, which used to glow when we press any remote key
6) u need to make parallel connection like current censor output and new censor output shud match in 1-1 , 2-2, 3-3.
7) now it ready( sorry close box with screw)
8) run RF cable and this censor cable from STB to other TV. U can Stick censor on any top corner of other tv , it work.
for any doubt post here i will try to help