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Putting antennas close together one inside the other like that will produce negative results.
Antenna cross talk detunes both antenna.
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You like the look of the vertical flat panel antennas.
I recommend install 2 separate antennas separated by 3 feet or more.
Install a Antennas Direct , Clear Stream 4 .
And the , C5 .
The C5 comes with a combiner to combine the , CS4 and C5 , antennas.
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It is also Ok to install the CM4228HD , vertical flat panel antenna.
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The best way to do reception is to have Reliable Reception First with a antenna.
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And then Experiment with other antennas and modifications of antennas.
You can run a separate coax to Tv/Reception Equipment in your , Experiment Room.
I think you will like to do , Tv DX and Radio DX , the projects will be interesting for a Long Time.
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http://www.summitsource.com.
Has the Antenna Craft , G1483 series of flat panel antennas , 4 bay , 8 bay , ANSG 16 bay .
The G1483 antennas are a old antenna design , known as the Gray Hoverman.
The Hoverman is more research for you to do , The design is a basic fractal antenna design.