I remember watching an Eurythmic's concert one friday nite which went out "Live" on channel 4" saturday. and thing like he Olympic games go out with out the comentry just track side audio, thing about feeds is you often get reporters or in the case of the concert sound checks etc being practiced all for like stated above a few seconds report , I use to just locate sats and scan them sometimes you'd get a test card sometimes these gave you a new freq to try ,must admit not had a go for 5-6 years now so my knowledge is well dated ,but a setup capable of seeing some not so much used sats tv that is is required 7e. 21w .18w etc