Do I need an external antenna?

The stock antenna that comes with most LoRa boards is a rubber duck (flexible whip) antenna, typically 3-5 dBi gain. For many use cases, this is adequate - but upgrading to an external antenna is one of the most cost-effective improvements you can make.

When the Stock Antenna is Fine

• Indoor portable use (office, home) within 200-500m of your nearest mesh node
• Temporary deployments where you're moving frequently
• Testing and development before a permanent installation
• Dense urban areas with many nearby nodes (short hop distances)

When You Should Upgrade

• Fixed outdoor installation - Any permanent outdoor node should use an external antenna rated for outdoor use. Stock rubber ducks are not weatherproof.
• Coverage issues - If you can't reach nodes you'd expect to reach, a better antenna is the first thing to try.
• Backbone repeater - Repeaters covering a neighborhood or city need the best possible antenna. A 5-8 dBi fiberglass omni provides 5-8 dB more gain than a typical rubber duck - roughly doubling the effective range.
• Point-to-point link - If you're trying to bridge two specific locations, a directional yagi provides 10-15 dBi gain and extends range dramatically.

What External Antenna to Buy

For most fixed outdoor deployments, a 915 MHz fiberglass omnidirectional antenna is the right choice:

• Taoglas TI.92.2113 (3 dBi) - $15-20, compact, good for moderate ranges
• Proxicast 5 dBi (ANT-DB5-5) - $25-35, good all-around outdoor omni
• Taoglas FXP73 (5 dBi, mag base) - $25-40, great for vehicle or temporary mounts
• L-com HG908U-PRO (8 dBi) - $45-60, excellent for high-gain omni backbone nodes

Connector Adapters

Most LoRa boards use SMA (male pin/female body on the board) or u.FL connectors. External antennas typically use N-connector or SMA. Match your connectors:

• Heltec V3, T-Beam: SMA female on board - use SMA male on pigtail or antenna
• RAK4631: u.FL (IPEX) connector - needs u.FL to SMA pigtail (~$5) to connect to any standard antenna
• T-Deck, T-Echo: SMA female - use SMA male pigtail or direct-connect SMA antenna