You will spend about the same amount of money with HD7084P installation and the HD7698P installation.
Might as well go for the whole taco.
The HD7084P.
There is no such antenna that receives only the channels that you are interested in receiving.
KLCS Real UHF channel 41 not Virtual (58.1) will be most likely received buy both the HD7698P and HD7084P.
Tvfool lists both the REAL channels that are received and the Virtual channels.
The REAL channels are what is transmitted and received.
http://forum.tvfool.com/showthread.php?t=9455