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Note:
Vertical separation is more important than horizontal separation. If you are unable to obtain
the required separation horizontally, try raising the exterior antenna. You may also try reducing the
booster gain as described in Chapter 5 of this manual.
Planning
Note:
You may or may not need antennas on every floor of a multistory building depending on factors
such as building material, booster gain, etc.
3.4 - Antenna Separation
Proper antenna separation is essential in order to prevent signal oscillation (feedback) that can
interfere with the cellular tower. Separation is measured in a straight line from the exterior antenna to
the closest interior antenna. The closest allowable distance depends on a number of factors such as
booster gain level, building material, etc. Recommended separation distances are:
40 dB 5-6 ft.
45 dB 15-20 ft.
50 dB 50 ft.
55 dB 60 ft.
65 dB 75-80 ft.
70 dB 100 ft.
75 dB 100-120 ft.
80 dB 120-180 ft.
Amplifier gain Minimum separation (ad)
