If you use a signal boost repeater then the repeater in
open air (outside) will go up to 2 miles. However, once
you bring the repeater inside a building, depending on
the building and its contents that range can and will be
reduced. Typically on a 1/2 square mile installation we
recently used four repeaters, but bear in mind that this
is purely a 'rule of thumb' and all installations will
vary with the requirements of signal boost repeaters.