Trouble with dual tuners one will not pickup all the stations the

Trouble with dual tuners one will not pickup all the stations the other one
can. Apparently the weaker one will only show a black screen where as the
better one will show the picture. My question is can the stations each tuner
receives be setup individually? It appears from what I have seen is when you
setup the "Digital TV antenna signal strength" each tuner is set to the same
stations. Am I missing something? As a side note is there anyway to know what
tuner you are currently watching?