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G21BW301111 Datasheet, PDF (7/21 Pages) List of Unclassifed Manufacturers – G21.W Hercules Gen.II Penta Band Cellular Antenna Screw-mount - White Version GSM/GPRS/CDMA/EVDO/UMTS/HSPA/WCDMA
4.2 Efficiency
Figure 5. Efficiency of G21 Hercules antenna in free space
Figure 6. Efficiency of G21 Hercules antenna on 30 cm metal plate.
SPE-12-8-155/C/EZ Page 7 of 21