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4
Step 1. Find the area with the Strongest Signal
The signal booster requires a minimum cellular signal of low –100 dBm.
Signal readings usually appear as a negative number (for example, -85). The
more bars you get, the closer the dB gets to zero. Aim for a signal close to
-50dB. Signals stronger than -50dB may cause the booster to shut down.
(see the graph below). Before installing the outside antenna, find the area
with the strongest cellular signal source from your service provider by follow-
ing the directions below. You can also go to www.antennasearch.com to find
the general location of carrier towers.
1. Measure the strength of the existing cellular signal in various locations.
• Apple iPhones: Dial *3001#12345#* and press Call. In the top-left corner,
a dB number appears instead of bars.
• Android devices: download apps such as “Network Signal Info” in the
Google Play store to measure signal strength. Search check real signal
strength to find other cell signal measurement apps.
• Internet: go to www.speedtest.net to test 3G and 4G data rates.
Finding the Strongest Signal
Cell
Tower
Outside
Antenna
Signal Strength
-50dB
-60dB
-70dB
-80dB
-90dB
-100dB
-110dB
Excellent
Good
Poor
