Perhaps allow networks, so long as the network is the ultimate entity, with no further links of ownership or management?

How about networks as a non-profit co-operative of their member entities?

On the other hand, I'm not sure that the broadcast network concept has much resonance outside the USA : I suspect that in most places, the nation-state defines the frontiers of the media market, i.e. national TV is the norm.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}