Antennamaker now offer products of own-made WiFi antenna , UHF, RF, GSM, Directional, GPS Antenna to upgrade ODM/OEM service of wireless solutions for whole word's customers.

Antenna News

Russia Requires WiFi Registration
While WiFi wasn’t as broadly unlicensed in Russia as it is in most other industrialized nations, your can not find wifi antenna anywhere a state regulator exempted indoor use in certain bands from registration. The Mass Media agency apparently believes that it has the authority to compel this, although there’s some doubt by observers as to whether it really falls in their purview.
RF Antenna WiFi Antenna GSM Antenna Directional Antenna UHF Antenna Contact Us Home
Home --> GPS Antenna --> GPS Internal Antenna



Compact & Sensitive GPS Antenna Module with Excellent Signal Amplification for Mobile Applications

GAM-25A is the most compact GPS antenna module currently available on the market, thanks to our cutting-edge technology that makes the device the tiniest possible without sacrificing performance. With comprehensive coverage almost all the way to the horizon, it performs excellently in foliage or urban canyon environment. Featuring diminutive but substantial enclosure plus unparalleled performance, GAM-25A is compatible with almost every GPS receiver model available on the market and provides a perfect alternative for a vast range of GPS applications in the fields of AVL, vehicle navigation, aviation and military.



Physical Condition


72.5mm (OD) x 8.5mm (H)


>30 grams

Environmental Conditions

Operation temperature

-40°C to +100°C

Storage temperature

-40°C to +100°C

Relative Humidity

40% to 95%

Electrical Specifications

Input voltage


Power Consumption

at 2.5V  6.6mA Typ.

at 3.0V  8.6mA Typ.

at 4.0V  12.6mA Typ.

at 5.0V  16.6mA Typ.


Frequency range

1575.42 ± 1.023 MHz

Gain at 10° elevation

-1 dBic Typ.

Gain at Zenith

5.0 dBic Typ.


10 MHz min. @S11λ-10 dB



Axial Ratio

3.0dB Typ.


Frequency range

1575.42 ± 1.023 MHz


28dB +/-3db

Noise Figure



20dB 25dB @ fo+/- 50MHz
30dB 35dB @ fo+/- 100MHz
* fo=1575.42MHz

Output Impedance

50 ohm

Output VSWR

2.0 max.

Total Specifications(Through Antenna, LNA, Cable and Connector)

Frequency range

1575.42 +/- 1.023 MHz


At 90° vertical to sky 30 ± 4.5dBi
(cable loss) Note:1
Mounted on the 60mm x 60mm square ground plane

Output Impedance

50 ohm


2.0 max.

*This specification is subject to change without prior noticeNote:1:Cable Loss=(-1.2dB/m)Data Updated: Mar 23, 2009

Copyright © AntennaMaker Ltd. All rights reserved.