[Jake V]

The Mohu Sky 60 is an antenna with a built in amplifier. Are you really adding a 4 way splitter with another amplifier? Or are you referring to the amp power supply that comes with the Mohu? An extra amplifier might not be necessary with those strong signals.

The first thing I would do would be to check all the connections to make sure they are nice and tight. A loose connection can make some channels go from strong reception quality to poor reception quality.

Next I would bypass the splitter and second amplifier and connect the Mohu Sky directly to one television. If that brings in Fox and WWOR and all the other stations you want then you know the antenna is sufficient (if the amplifier and splitter are located together this can typically be done using a female-to-female coax connector, which is probably about $2). If this brings in Fox and WWOR then it might be a matter of 1) not using the second amplifier or 2) using a different splitter (check both your extra amplifier and splitter and post the part numbers here).

What direction is the Mohu Sky antenna is pointing to? The flat side should be facing about 47 degrees using a compass (roughly northeast). The manufacturer suggests its an omnidirectional antenna but really it is not.

If you have a clear line of sight from the north to the east it seems that you should be getting all the stations in green and most of the stations in yellow.