The signal strength of KLST CBS at a antenna height of 40 to 45 feet is very weak at minus -12.3 NM(dBm) , and may not be received reliably. I hope there are No trees in the direction of KLST. The next increase of signal strength that is worth going after is with a antenna height of 80 feet , That increases signal strength to minus -8.1 NM(dBm) , -8.1 would most likley give a reliable signal for KLST CBS. Going to 90 or 100 feet or more does not give a increase of signal strength that is worth going that high. Here are some places to buy antennas and etc. ,
http://www.winegarddirect.com ,
http://www.solidsignal.com ,
http://www.amazon.com.