9
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
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:
Note:
You may or may not need antennas on every floor of a multistory building depending on fac-
tors such as building material, booster gain, etc.
40dB 5-6’
45dB 15-20’
50dB 50’
55dB 60’
65dB 75-80’
70dB 100’
75dB 100’-120’
80dB 120’-180’
Amplifier gain Min. separation (ad)
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