Being married to an electrical engineer whose specialty is microwave-band communications, we bandy all kinds of odd words about, with disgusting regularity, in this house. Faraday cage. Gigahertz range. 50db. Ground plane (not a plane on the tarmac). Impedance. Lossy. Non-ideal. Non-linear. RF. Plus lots more.
We have a wireless network that works within the confines of the office, roughly. The house was built in 1952/53, during civil defense days. The walls are 3/8" rock lath, covered by 3/8" of a very sandy, brownish cement, covered by 1/4" hard plaster. Ceilings (basement and first floor) have expanded metal lath. The whole house is basically a set of interconnected Faraday cages. To download books to my Kindle, I cannot be farther away than the dining room. My daughter's laptop regularly loses its connection from the living room. All the business hardware (and much of the non-business hardware) is hard-wired to the network -- and will stay that way! I've worked in plenty of office buildings with fewer pieces of equipment and simpler network configurations than what we have here...
Yes, you do have to be aware of the frequency bands of the various other bits and pieces around your wireless network. You need to be aware of metal studs in office building walls, expanded metal lath, and more. Plus with a wireless network you also have to have security protocols. It's best to have the network locked down so that only equipment with approved MAC addresses can even see the network. Anyone coming here with a wifi laptop can see several of the neighbors' networks (only *some* of which are secured) -- but even sitting right next to the hub, cannot see ours.