They do reduce the required distance for Sea-Scorching and make Midseasons more useful, too. It's pretty easy to use them to net 6 credits at a minimum in a game, even without many tracing cards.
Primary Transmission dish, in addition to taking up a card slot and the time to play, might provide a 4-credit swing (3 for its ability, 3 to trash, 2 to re it in the first place) if it gets into a remote server. Useful for later on, by and large, unless NEH manages to make it hard enough to trash that it can just be used more than once. Seems doubtful.
That makes more sense, was very confused.