Their capture card will most likely do a better downconvert than nesting your sequence into an SD one. So you may want to bring them a ProRes/Uncompressed self-contained movie in your native resolution (720). It all depends on the system that will be used. So again, ask them.
And you also have to make sure that you video levels are right...100IRE for the whites, 7.5 IRE for the blacks. WHich means proper color correction for broadcast.
Audio has to fall within a certain range (typically peaking at -12db).