From 1 May 2012 Supertennis channel will broadcast in HD only on the satellite by the name of Supertennis HD.
source
www.supertennis.tv
I searched for this yesterday for a customer and it seems this is the latest:
Eutelsat Hot Bird 13B 13.0°E 12476 H DVB-S2. 8PSK. MPEG-4 29900. 3/4
I Wide
0 N Schlammer
121116
When you try the main super tennis URL there's a redirect to the iTunes Store which in turn doesn't work... Will update with any more info...