5.8Ghz doesn't have good penetration THROUGH things, so you'll always have trouble if you lose line of sight behind a building or solid group of trees.
that being said, proper antennas make ALL the difference for good range especially in a high interference environment like a city or a dense cluster of apartment buildings with tons of wifi routers all sending signals into the air.
I suggest you check out the stickythread in the FPV forum
Antenna Connectors reference it may help you understand the various connectors, and exactly which ones you need for your equipment