You answered your own question regarding getting shocked. You said that you keep running into reversed polarity on the electrical. A three prong outlet has a hot (black), a common (white), and a ground (usually green.) The common and ground take two different paths to get to fundamentally the same point, so putting a voltmeter between the hot and common or hot and ground should both show about 120vac. The hot connection in the outlet is the small tip where the wider tip is the common. A lot of electrical devices take the common to the outside shell of the device, although this is usually done with devices that don't use a three prong plug. If the common is run to the case, but your household wiring is backwards and it is really the hot, touching the case while holding on to something that is grounded, like your RG6 will run 120vac through your body. Buy a $5 outlet tester and check all your outlets. If the outlets you are checking aren't grounded, use a grounded extension cord plugged into a properly wired outlet, then use a volt meter between the smaller prong on the outlet and the ground on the extension cord. If the outlet is properly wired, this test will show 120vac. However, if the common from the outlet (the large prong) and the ground on the extension cord shows voltage, the outlet is backwards or else you have a problem with your ground. Having the common and hot backwards is the mark of a very amature electrician and can be very dangerous. Running 120vac through your body is usually just startling and annoying, but under the wrong conditions it can kill you.