antenna configuration

So i have been struggling to figure the answer out to this question for a while now. I bought the RTL-SDR kit and i don't know how to configure the antenna, videos on youtube have conflicting answers i see one person say use it one way and then another person in a different video says to use it...

I'm working on planning/pricing a Capacity Plus system but I'm not sure what antenna configuration would make the most sense. The system will be VHF and the sites will have 2 channels/4 slots each with 50W output. Since there will only be 2 repeaters per site it seems like the best option...