Yes the PBS stations are all part of main tv stations and repeater networks.
http://en.wikipedia.org/wiki/Iowa_Public_Television ,
http://en.wikipedia.org/wiki/Nebrask...communications. There will most likley be enough signal strength for 2 tv's with a simple common 2 way splitter. If KUON-DT 12 PBS is a little if'y being split 2 ways then install a Channel Master CM3412 2 way distribution amp. For 3 or 4 tv's install a CM3414 4 way distribution amp.
http://www.channelmasterstore.com. Put 75 ohm terminators on any unused out put ports of the distribution amp. . If silicone grease is put in the boots , but not in the connectors , the silicone grease will keep water from collecting in the boot and corroding the connection.