MatCat:
should I do any other form of amplification or do you feel this is solid enough to split the signal out 4 ways?
Depends on the 4 video input channels you are driving. If they have the means to 'turn off' their 75 ohm input matching impedance resistor and have a 'daisy chain' video input and output connectors then you can loop into and out of the first 3 video receivers and only have the last receiver have it's 75 ohm termination resistor turned on. If however you want to drive 4, 75 ohm video input stages in parallel that represents a 18.75 ohm load and your circuit cannot provide enough current to drive them all wired in parallel.
Lefty