I had an 811 installed in mid-January and I was receiving  local CBS, ABC, Pax and PBS OTA in digital.  Sometime in early March, I totally lost the digital ABC and PBS channels.  The ABC went from high 60's and low 70's to 0 and PBS disappeared despite being 85% for 6 entire weeks.  I have never been able to get them back.  Does any one have any suggestions?
				
			 
	 
	 
 
		
 
 
		 
 
		 
 
		