CarterB's advice is good. Also note that the AlphaDelta you linked uses type N connectors which are slightly superior (less loss) to PL-259 connectors (named "UHF" when 50MHz was UHF
) at railroad frequencies. Your local building code, electric, will likely have grounding requirements. Also, it is extremely important to weatherproof the PL259 / UHF connectors, once water gets in the coax losses will skyrocket. Some N connectors are purportedly waterproof when properly installed but I would err on the side of caution and waterproof them as well. Also bend the coax down in a "U" shape (not too tight a U or coax can be damaged) just before it enters the building to form a "drip loop" so water does not easily run along to coax to into the building.
Some of these articles are more info than you need, but some may help: http://www.arrl.org/lightning-protection