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If the antenna is a CS2 , without the VHF reception rods.
Then order and install the VHF rods reception kit from ,
http://www.antennasdirect.com.
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Install the CS2 with the VHF reception rods kit , Above The Peak of the Roof in such a manner that the antenna has clear views that are not , obstructed , impeded , blocked , by the roof and building in the directions of , North West and East .
Aim the antenna at about 295 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real And Actual magnetic compass to aim antenna.
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The signal strengths are strong for the Tv stations to the North West and East , a antenna system amplifier will most likely not be required.
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1 of the channels you have listed is 20.
I am thinking that it is KOFY-TV and not KSCZ-LD.