If I have 1 DVR and 4 HD receivers connected for the whole home DVR setup, to receive local channels that DirecTV doesn't carry would I have to have an AM21 on each receiver or just the DVR?
				
			If I have 1 DVR and 4 HD receivers connected for the whole home DVR setup, to receive local channels that DirecTV doesn't carry would I have to have an AM21 on each receiver or just the DVR?


 
	