Using , New , coax , connectors , connections , and etc. , Is Important.
After all is set up and working.
To make double sure that weather/water does not get into outside , coax , connectors , connections , matching transformer (balun) , and etc. , wrap with
http://www.coaxseal.com.
_______________
ALL , coax , connectors , connections , and etc. , through out the system is/are suspect of being bad.
To Prove reception , run a New continues length of coax from the matching transformer (balun) at the antenna , through a open door or window , direct to 1 Tv.
_________________________________________
The signal strengths at your location will most likely provide pleanty of signal strength for a 2 or 3 way splitter.
Yes you can -Test- reception with a signal amplifier , use a Winegard , LNA-100 'Boost' amplifier.