Just tried a real world test of our new wireless cell signal booster WeBoost Drive 4G-X. Temp setup, mini magnetic "outdoor" antenna on the dash on a metal ground plane, not on the roof as it will be in the future. Location Thousand Trails Gordonville TX. No booster, Verizon signal is -97 dBm, with booster signal is* -64 dBm. This is with the cell phone and MiFi used to measure signal 2" away from internal antenna. The power levels picked up by a cellular antenna are fractions of a milliwatts, so the dBm readout will be a negative number. -50dBm would be considered an awesome signal. -60dBm is 10x weaker, but still great. -70dBm is 100x weaker. -80dBm is 1,000x weaker. -90dBm is 10,000x weaker. -100dBm is 100,000x weaker - and is when you are likely to start seeing a serious impact. -110dBm is a million times weaker than -50dBm and is usually barely usable. And by the time you see -120dBm, the phone has probably already given up and switched to "No Service."