Using a TRIAX MOD103T Single DVB-T HD 1080P HDMI DVB-T RF Modulator

This might be a Q for any UK members but I suspect anyone who watches tv through a 'box' might be able to help.
I have a SKY box in my tv room downstairs and have a cable going from the box to my tv upstairs ( with a magic eye ) that allows me to watch SKY but it's an analogue picture. The picture is ok but it isn't HD. I'm told by my 'tv guy' that the way to get an HD picture upstairs is to add a TRIAX MOD103T Single DVB-T HD 1080P HDMI DVB-T RF Modulator to the back of the box.
Is this the only way to fix the problem. This box costs £199 ( $245 )..so it's an expensive fix...if I decide to do it.
Any thoughts.
 
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