When understanding signal attenuation along a coaxial cable from an antenna to the television (e.g., signal loss from splitters, coaxial connections, etc), it's also important to understand what the signal power at the starting point is (i.e., at the antenna).
How can we determine signal power at the antenna, before it travels down to the TV?
For instance, my TV antenna has around 12 decibels of antenna gain (it's not amplified). Would this pretty much be the "starting" signal power before it heads for the TV, or is the signal strength calculation more complicated than just using the antenna gain figure? (e.g., depends on the noise margin of the particular TV channel).