The following are ultra-high frequency (UHF, usually referring to the 300MHz-3GHz frequency band) antenna recommendations and selection points for different application scenarios for reference:

Ⅰ. Recommended according to application scenarios

1. Wireless communication (walkie-talkie, public network)

Handheld Devices:
Nagoya NA-771 (400-470MHz): High gain (5.5dBi) for amateur radio or commercial walkie-talkies.
Comet SMA-24 (400-520MHz): Flexible rubber antenna, portable and durable.
Base Station/Relay Station:
Diamond X50A (400-470MHz): 5.5dBi FRP antenna, suitable for roof erection.
Laird FG4503 (450-470MHz): 6dBi omnidirectional antenna, industrial-grade anti-interference.

2. Broadcast and TV (UHF band 470-862MHz)

Yagi directional antenna:
Antennas Direct 91XG (470-862MHz): High gain (10.5dBi), suitable for receiving digital TV signals over long distances.
Log Periodic Antennas: such as Titan Log Periodic, wide frequency band coverage, anti-multipath interference.

3. RFID/IoT (860-960MHz)

Circularly polarized antennas:
Laird S9028PCR (865-928MHz): 9dBi, suitable for RFID readers.
Taoglas MA.931: Small patch antenna for embedded devices.

4. Military/Aviation (225-400MHz)

Broadband Antenna:
Diamond D130 (118-1000MHz): Wideband discone antenna for monitoring and emergency communications.
Blanton ARA-25 (225-400MHz): High power tolerance, military-grade design.

5. 5G/WiFi（2.4-2.5GHz/3.5GHz）

MIMO Antenna:
Poynting XPOL-2 (2.4-2.5GHz): Dual-polarization to improve multipath environmental performance.
MikroTik SXT 5GHz (5GHz band optional): High-gain directional antenna for long-distance WiFi.

Ⅱ. the key parameters of selection

1. Frequency range: Make sure the antenna covers the target frequency band (such as 400-470MHz, 800-960MHz, etc.).
2. Gain (dBi): The higher the gain, the more directional it is, but the coverage angle may be narrower.
3. Polarization:
Linear Polarization (Vertical/Horizontal): Universal communication.
Circularly polarized: mobile-friendly (e.g. drones, RFID).
4. VSWR (Standing Wave Ratio): Ideal value ≤ 1.5, too high will cause signal reflection.
5. Environmental resistance: waterproof (IP67) and UV-proof for outdoor use.

Ⅲ. Precautions

Installation location: Away from metal obstacles, the height affects the coverage.
Regulatory compliance: Ensure that antennas comply with local radio regulatory requirements (e.g., China SRRC certification).
Power matching: High-power antennas (such as 50W or more) need to be selected for high-power transmission.