I am thinking of upgrading to a HR21.  I currently have a H20.  I have two lines coming off the dish etc.  Is there anything special I need to do before I hook up the HR 21?  I was looking over the HR 21 manual. It talks about a SWM (single wire module).  How do I tell if my installation includes a SWM?
				
			 
	 
	 
 
		 
 
		 
 
		

 
 
		 
 
		 
 
		 
 
		 
 
		