Amazon.com: Retevis RT73 DMR Radio, Dual Band Mobile Transceiver, Digital Mobile Radio with GPS APRS, 200000 Contacts 2 Time Slot, 2m 70cm Mini Mobile Two Way Radio for Vehicle Jeep(1 Pack) : Electronics
What Is Dual-Frequency GPS and Why Is Apple Using It - Guiding Tech
GPS Active Dual Band Antenna Operates From 1.22 GHz to 1.58 GHz With a Nominal 6 dBic Gain N Female Input Connector
YAESU FTM-300DR 50W Dual Band Transceiver Car Mobile Radio Bluetooth GPS 10Km | eBay
Dual-frequency GNSS on Android devices | by Sean Barbeau | Medium
Using a Multi-Band Outdoor Handheld | Garmin Customer Support