If you can get a good enough signal for reliable reception on one set, there's almost always a way to provide a good enough signal to all of your sets. If necessary, amplification can be used if there isn't sufficient signal power available to overcome the losses in your distribution system. By and large, that makes the total number of sets a secondary piece of data, well behind the requirements of getting an adequate signal in the first place.
If it comes down to either using a much larger antenna (at additional cost) to overcome distribution losses or an amplifer to overcome those lossses, the amplifier often wins.
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