I have a + box installed in my living room with a co-ax cable run up the outside wall thru the loft and down the outside again and thru into my kids toyroom.  I have used the tvlink product for a year to change channels etc as I dont want another sky box in the toyroom.  Today i have upgraded the tv in the toyroom to a 40" HD Tosh LCD from a 26" Sharp LCD.  The quality of the picture is pretty poor.  Can anyone suggest my options to improve the quality of the picture without installing multiroom in the toyroom or if I get multiroom installed can the additional box be installed in the living room next to the current one and cabled into the toyroom like the coax is at the moment allowing me to control the multiroom from the toyroom but have the box in the living room

Your guidance would be much appreciated.