The stucko is held in place with stucko Wire. The Tv transmissions at your location are Very Strong. I suggest try one of these Non amplified indoor Tv antennas and see if the Tv transmissions get through the Wire Ok.
http://forum.tvfool.com/showthread.php?t=233 Put the indoor antenna on the second floor on the side of the house that is close to the transmitters . The other 4 Tv's will be connected to one of the antennas that Dave suggests with a 4 way splitter to the 4 Tv's. The Tv channels are digital so the Tv's need to be set to receive the Digital Broadcast Tv Channels. If some of the Tv's are not digital then here are converter boxes to use ,
http://forum.tvfool.com/showthread.php?t=380. As Dave says , the outdoor antenna does not need to be up high , but does need a clear shot at the Tv transmitters at 86 degree magnetic compass. Here is how to aim Tv antennas ,
http://www.kyes.com/antenna/pointing/pointing.html