Line of Sight?

 A week ago the H20 HD receiver in our bedroom started showing black screens on all channels. There was no error code on the screen.  I called Directv and they advised me to reset with the red button by the access card.  When I did this I got the start-up screen with the "searching for satellite" message.  Needless to say, the satellite signal was not found.  When I was instructed to access the menu and check the signal strength there were all "0"s indicating a complete loss of signal.   The other receiver in the living room which is an SD was having no problems and I checked the signal strengths and will post them if needed.  Most were in the 90% but since the HD satellites are'nt available to check I don't know if posting these will help.

Anyway,to make an already "too long" story short,  since then we have had two technicians out and both insist that this is a line of sight issue.  I'm no satellite tech but it seems to me that if one receiver is getting a good signal and the other is getting a zero signal from the same satellite dish it seems that there must be something else going on here.  Do you have any suggestions or should I just give up and go with cable.