Atreyu

Thanks a lot for the replies. This is all making a lot more sense to me now!

I have a house that is pretty old with a crawl space that isn't very accessible. Even if I ran wires in the crawl space... I am trying to avoid drilling multiple holes through all of my exterior walls. So I decided running conduit outside of the house is probably my best option. I picked up a 4 camera 8 channel package and installed one camera to monitor my front door. But now I am confused as to what diameter of conduit I should be running for the rest of the cameras. If I am using bnc connectors (http://nightowlsp.com/products/cables-accessories/cables/cab-24awgg-100vp.html [link meant for identification purposes since I am new to this and have no clue how else to describe it]) what diameter of conduit would you suggest for 3 wires? What about 7 wires if I would like to add more cameras? Would running a larger diameter main and splitting it to smaller diameters with a junction box be a reasonable idea? Thanks in advance.

Thanks for the reply. I am going to do some more research now and I am sure I will have more questions. This is a cheap system that has a wire soldered to the center pin and another soldered to the casing for a ground (I cut it apart). If I can run actual coaxial cable and (https://www.anixter.com/en_us/products/FSNS6BNCU-25/BELDEN/Coaxial-Connectors/p/FSNS6BNCU?utm_source=google&utm_term=&utm_campaign=&utm_medium=cpc&utm_content=s_dc~106968659190~~&gclid=CLPFraCrs9ICFdi1wAodX1QKrQ) do something like this... As long as it has the same connection it will work? I will be trying to figure out the difference from rg6 and rg59 but I have to get some sleep for now. Again, thanks for the help.