digitaldc writes "[Repeaters], which cost from $250 to $1,000, depending on how much they increase a signal, work by first capturing cell signals through an external antenna, ideally affixed to the roof of a dwelling. A coaxial cable then transmits the signal inside the house to an amplifier and internal antenna, which strengthen and retransmit it to cellphones... In March, CTIA-The Wireless Association, which represents cellular service providers, filed a complaint with the Federal Communications Commission demanding stricter regulation of signal boosters."
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