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Fortunately, a simple installation does not require us to be concerned w/ impedance, since using a BALUN to convert from the 2 wire antenna output, to a coax input, changes the impedance for us, automatically.
An analogy that helped me understand the concept, was to picture a clothesline, with the ground as the operating threshold and the line as the signal.
Too many items, or a few heavy ones, will pull the signal down too much.
Some may still work fine, while others may then be below threshold.
If a distribution amp is used for multiple sets, it's like having individual clotheslines.
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