In it's day , the CA8100 was 'top of the line' , and still is 'top of line' even though it is no longer manufactured.
If the antenna is still in serviceable condition , install a ,
http://www.kitztech.com , KT-200 High Gain - Ultra Low Noise antenna booster in place of the AP8275 preamp.
Do not use the Electroline 4 way drop amp.
Use a , HFS-4D , 4 way splitter.
From the HFS-4D 4 way splitter a coax will go out to each of the 4 Tv's , this is known as home run wiring.
If 4 Tv's are not connected , then use , HFS-3D or HFS-2D splitters.
If 1 Tv is connected use no splitter.
(Do not use loop wiring , loop wiring is , a coax wire starts at a location and goes to location and from that location a coax goes to an other location and from that location an other coax wire goes to an other location , loop de loop de loop , and at at the end of loop hops there is not much signal.)
Buy the HFS splitters at ,
http://www.hollandelectronics.com , or ,
http://www.solidsignal.com.
If the CA8100 is not in serviceable condition , or better reception then the CA8100 can provide is required.
Then install a Winegard HD7698P antenna , with the Kitz Tech antenna booster , aimed at about 345 degree magnetic compass.
Looking at the Digital Current Plus Pending Applications Included tvfool channel list.
You are reaching out for the Digital Tv stations/channels in the magnetic compass direction of about 345 degree.
I suspect but can not say for sure that the Digital Tv stations down to and including WCPX UHF channel 43 ION television will be reliably received.
As always trees and tree leaves do a real fine job of reducing or blocking reception and so do buildings and other obstructions.
It is best to install the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception.
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---->You selected and used these words --> 1080i capable Tv.<----
You say the the Samsung is 1080i capable Tv.
This leads me to believe that it is a older Tv with one of the older generations of Digital Broadcast Tuner??
And most of those 1080i capable Tv's had no Digital tuners.
Is a external Digital Broadcast Tv tuner being used??
And if so , what is the make and model number of the external digital tuner??
What is the model number of the Samsung Tv?? , and is this the only Tv that is connected??
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I have a question , What is the Weakest digital tv channel that is being reliable received??