I recommend remove and discard ALL of the old antenna set up and discard the rotor and discard all the outside coax.
Install All new on the outside.
Antenna rotators Are Not channel surfing friendly , I recommend Do Not install a new rotator.
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Yes , install the HD7084P antenna aimed at about 39 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Also install a , Ultra Low Noise ,
http://www.kitztech.com , KT-200 remote power coax fed amplifier booster.
The remote power coax fed amplifier provides the flexibility to install the amplifier unit outdoors or indoors.
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For 1 Tv connected use no splitter.
For 2 Tv's connected use a , HFS-2D , 2 way splitter.
For 3 Tv's connected use a , HFS-3D , 3 way splitter.
Buy the HFS splitters at ,
http://www.holladelectronics.com , or ,
http://www.solidsignal.com
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WOI-DT VHF channel 05 , ABC and Live Well Network ,
http://en.wikipedia.org/wiki/WOI-DT.
KDMI-DT UHF channel 19 , This Tv and MY Network ,
http://en.wikipedia.org/wiki/KDMI.
KDSM-TV UHF channel 16 , FOX and Country Network ,
http://en.wikipedia.org/wiki/KDSM-TV.
KCCI-DT VHF channel 08 , CBS and Me-TV ,
http://en.wikipedia.org/wiki/KCCI.
WHO-DT VHF channel 13 , NBC and Iowa Weather Channel and Antenna Tv ,
http://en.wikipedia.org/wiki/WHO-DT.
KDIN-DT VHF channel 11 , PBS ,
http://en.wikipedia.org/wiki/Iowa_Public_Television.
KCWI-DT UHF channel 23 , CW ,
http://en.wikipedia.org/wiki/KCWI-TV.
KHIN PBS is off axis (on the side of the antenna) and that will reduce signal strength , however the signal strength at 39.4 NM(dB) is moderate strong , and should still be received.
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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 ,
http://www.kitztech.com.