A21 GPS Antenna

Hemisphere A21 GPS Antenna

The Hemisphere GPS A21 GPS single-frequency antenna tracks GPS L1 signals and supports differential correction services such as SBAS and L-Band services.



The A21 single-frequency antenna from Hemisphere GNSS tracks GPS L1 signals and supports differential correction services such as SBAS and L-Band services. It provides excellent noise rejection and is capable of filtering out an additional 30 decibels of radio band frequencies. Furthermore, the A21 antenna offers enhanced multipath mitigation, which effectively reduces interferences caused by signals being reflected off surfaces such as trees, windows of buildings and ground.

The A21 antenna is specifically designed for Hemisphere GNSS Crescent and Crescent Vector II receivers.


  • Support correction services such as SBAS, L-Band (OmniSTAR)
  • Aluminum base
  • Excellent noise reduction
  • Enhanced multipath mitigation
  • Rugged design

Technical Specifications

Channels:GPS L1, L-Band and SBAS
Dimensions:13.0 cm (diameter) x 7.0 cm (height)
Weight:0.38 kg
Mount:5/8-inch female thread
Connector:RF: TNC-Straight
Operating Temperature:-40 C to +85 C
Vibration and Shock Resistance:EP455


Hemisphere GNSS products come with a one-year warranty. The warranty, provided by Hemisphere GNSS, means products are guaranteed against defective material and workmanship under normal use for a period of 12 months from the date of shipment. Accessories come with a similar 90-day warranty. The warranty is covered in more detail in the Hemisphere GNSS Service Policy document.

Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for Hemisphere GNSS and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The A21 antenna from Hemisphere GNSS delivers accurate results even in harsh environments. The antenna is available through Canal Geomatics. Please use the Request Pricing form to contact us for further information.