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First of all, if you have a any VHF channels, the diagram that Mike Kohl posted for using 3 of these


http://www.solidsignal.com/pview.as...-Separator/Combiner-for-Antenna-(UVSJ)&q=uvsj


You can separate and combine the VHF channels separately so that the VHF will not have to go through as many splitters as the UHF will have to go through.


When using 2 way splitters to combine 2 or more antennas, it is best to trap, filter, out any frequencies that you can.

For example, if toy have channel 14 from one antenna, it is best to trap channel 14 from the other antenna. Especially if amps are being used, amps will put noise on channels that have no channel on them, so they will cause interference on the other.


If you are looking around for traps, you can look on EBay for them by figuring out the cable channel that corresponds to the UHF channel; for channels 14-43, add 51, for channels 44 and so on, add 56.


So, if you see a trap like this one, http://www.ebay.com/itm/ARCOM-Cable...194645?hash=item3ab92331d5:g:JOQAAOSwF1dUOz6-

Which removes cable channels 24-72, it will remove up to UHF 21; 17-51= 21


Channel Plus seems to put their brand name on traps, it seems that only Eagle Commtronics, PPC and Arcom are making them now, You can find traps like this one, that will remove UHF 24-29 Amazon product ASIN B000J3AEYA


For VHF channels, you can buy specific channel negative traps , such as these, http://www.atvresearch.com/MNtraps.aspx


Now, you can use something that is called a "low pass filter" if your channels from one location are located on a higher frequency than the other, for this you will have to find the MHZ range for the channels, such as this one that will trap UHF channels above 37.


The only low pass filters that I have found are for 470, 600, or 750 MHz. I was able to find one that traps UHF channel 34 and above, http://www.bmisurplus.com/products/10418-microwave-filter-co-fastrap-5klp-5768-lowpass-filter


I would be able to combine a third antenna, if I were able to get a trap that removed channels UHF 29-47, but allowed 48 and 49 to go through, until then I will be suing an A/B switch.