The antenna you have now looks like a All Channel antenna , that is good because the the Tv stations/channels to the north east are transmitting in all three Tv bands of , VHF low band channels 2 thru 6 , VHF high band of channels 7 thru 13 and UHF band channels 14 thru 51.
Do not substitute the HD7698P antenna for All band antenna you have now.
The HD7698P is designed to receive channels 7 thru 51 and not 2 thru 6 as the one you have now does.
Here are some other ways to get more antenna height for the HD7698P antenna aimed at Chicago.
http://www.ronard.com/Tripods%200703/4712.html.
Buy the ronard antenna mount at solidsignal by typing the word ronard in the solidfsignal search box.
The tripod roof top mount does not require guy wires like the push up mounts do.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.amazon.com.
Here is another way to get more antenna height.
A free standing , layover , light weight , aluminum tower. Do antenna mounting and adjustments standing on the ground.
http://www.palcoelectronics.com/pe300.aspx.