What antenna will work best for my customers?
It depends on how he or she uses the phone. 0 decibel (dB) gain antennas, often called unity gain, are usually best in cities or mountains because they provide the same coverage vertically and horizontally (note: this statement is not always true when there is good coverage in those areas). Cellular was originally designed for 3dB gain antennas as they provide the optimal combination of vertical and horizontal patterns. 5dB antennas are the best for flat areas because their pattern is primarily horizontal.