For reception of these Local Digital Broadcast Tv stations/channels.
With 1 antenna aimed 1 direction.
WPMT , FOX and Antenna Tv.
WGAL , NBC and This Tv.
WLYH , CW and LWN Live Well Network.
WHTM , ABC and RTV and Local Weather.
WHP , CBS and MyTv.
WITF , PBS channels.
WGCB , Me-Tv.
Above the Peak of the Roof in such a manner that the roof and house are not impeding and blocking reception to the , North West , North East , East , South East.
Install a Winegard HD7698P antenna aimed at about 0 degree magnetic compass direction , North.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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Install a Winegard , LNA-100 'Boost' antenna system amplifier.
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Here are some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.winegarddirect.com.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a simple common 2 way splitter.
For 3 Tv's connected use a simple common 3 way splitter.
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The receivable Digital Tv stations/channels to the , South , Baltimore , Weaker Signal Strengths and are the same networks you are receiving , NBC , ABC , CBS , FOX , CW , PBS .
You can Test reception by aiming the HD7698P antenna at about 202 degree magnetic compass direction.
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Digital Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Recommend Double Rescan ,
http://www.dtv.gov/rescan.html.
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The Tv stations to the West are Very Weak Signal Strength , you can Test reception , aim the HD7698P antenna at about 256 degree magnetic compass direction.
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You can find what Networks are being transmitted by Tv stations.
In the Google or Yahoo search boxes type in variations of the Tv stations call signs.
Example:
whtm tv , whtm-tv , whtm-dt , whtm , whtm 10 , whtm-10 , whtm abc , and etc. .
Two web sites that will be found that have the Practical and Useful information are , wikipedia and rabbitears.net .