You will need to cut and solder on a small piece of wire (any solid or stranded core is fine) in order to create your antenna. Optionally you can pick up a uFL or SMA edge-mount connector and attach an external duck.

Can I use three or more to broadcast to each other?

Yo dedicate a node to recieve traffic and others to transmit, of course you can alternate at code level to switch between being reciever or transmiter, but that will be hard to orchestrate. So generally u have one node as a gateway (reciever + internet -> iot platform) and senders ....

I am in brazil and here we use the australian frequency channeling (au915). does this device work on au915?

Yes, it works in the 915MHz band

What is the us law on using this? can i continously trasmit data?

It uses the license free ISM band, so you can use it in the US within the power limits that can be defined with the board.

Adafruit (PID 3072 RFM95W LoRa Radio Transceiver Breakout - 868 or 915 MHz

Product ID: 35804462

Details

Assembly Required
No
Brand
Adafruit
Item Weight
0.01 Ounces
Manufacturer
Adafruit
Size
2.9cm x 2.5cm

📡868/915 MHz LoRa frequency

🔋Built-in voltage regulator & level shifter

🛡️Protective tin casing

R984

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Details

Assembly Required
No
Brand
Adafruit
Item Weight
0.01 Ounces

Description

📡 Unlock limitless wireless potential—connect smarter, farther, faster!

ROBUST POWER MANAGEMENT - Built-in voltage regulator and level shifter ensure seamless compatibility with 3.3V & 5V devices.
VERSATILE ANTENNA SUPPORT - Supports UF.L and SMA PCB-edge connectors for flexible, high-gain antenna setups.
DURABLE WEATHER RESISTANT - Protective tin enclosure guards your module from environmental wear—built to last in the field.
LONG RANGE LO RA CONNECTIVITY - Reach up to 30 miles with advanced spreading factors—stay connected beyond the horizon.
PLUG AND PLAY ARDUINO LIBRARIES - Simplify your IoT projects with ready-to-use code—no pairing or scanning needed.

The Adafruit RFM95W LoRa Radio Transceiver Breakout (PID 3072) operates on 868 or 915 MHz frequencies, offering long-range wireless communication up to 30 miles with advanced spreading factors. It features a built-in voltage regulator and level shifter for compatibility with both 3.3V and 5V devices, comes with a protective tin casing for durability, and supports multiple antenna connector types. Ready-to-use Arduino libraries make integration effortless, eliminating the need for complex pairing or scanning.

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