I expect that you will have enough signal from the suggested antenna that you would be able to feed a 4-way splitter. The symptoms of to much loss would be pixelation of the picture or 'no signal'. You will not get a reversion to lower definition.
If you need to split many ways you can use something like this...
http://www.amazon.com/Bi-Directional...7426760&sr=1-1
It has enough gain to overcome the loss of the built-in 8-way split and about 100' of coax beyond.