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When connecting your battery, connect the positive (red) first and the negative (black) second. When removing the battery, disconnect the negative (black) first and the positive (red) second. Been doing this for nearly 30 years. ALWAYS connect the positive post first.
Connect one end of the coaxial cable to the outdoor antenna. Attach the other end to the amplifier. Attach a second piece of coaxial cable to the indoor antenna. Attach the other end to the amplifier. Check your cell phone's signal strength and make a call.