I have an old DTV setup that dates from 204. I have an 18" round dish with a dual LNB. I have a newer TIVO a TH22 ( I think). This is due to my location's inability to see the newer satellites. A few years ago our signal would cut out when it was quite hot outdoors, we could get the signal back by taking a garden ose to the LNB. A service guy came and replaced the LNB with a used one he had, claiming there were no new ones. Our signal is getting a little erratic lately and am wondering if it is the LNB. Are the dual LNB's that are available through Amazon and Solid Signalwhat I think I need?