Do I need to add my own antenna?

Depends on range to the access point it is connecting to. I have mine installed on wall socket about 10 feet away and have no transmission issues.

The launch distance on this says 20-200 meters. Is it able to transmit and receive a signal that it less than 20 meters?

yes i would think there is no reason to have a minimum distance. I think they probably mean it will work up to 20 meters for sure and it might work up to 200 under certain conditions.

Is it possible to change the frequency of both the receiver and trasmitter?

No. See the can on the transmitter, where it says 315? You would have to change to different frequency component. If you want a 433MHz, then just buy that version. The receiver might be somewhat adjustable, but no idea how much.

Do these have to be used for data? Or are these a direct 1 to 1 from signal to output? Could I use these just the wirelessly fire a relay?

“Data” is simply encoded as on or off, and checked by the receiver at specified time intervals. It can definitely be used to fire a relay, or toggle one.

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🚀 Elevate Your Projects with Precision and Power!

LOW POWER CONSUMPTION - Static current of just 4mA ensures energy efficiency.
UNLEASH YOUR CREATIVITY - Perfect for DIY projects with Arduino, Raspberry Pi, and more!
SUPERREGENERATIVE TECHNOLOGY - Experience enhanced performance with cutting-edge receiving technology.
ADVANCED MODULATION TECHNIQUES - Utilizes ASK/OOK for reliable communication.
VERSATILE VOLTAGE COMPATIBILITY - Operates seamlessly between 3V to 12V for ultimate flexibility.

The HiLetgo 315MHz RF Transmitter and Receiver Module Kit is designed for tech enthusiasts and professionals alike, offering a versatile voltage range of 3V-12V and low power consumption. With advanced ASK/OOK modulation and superregenerative receiving technology, this kit is perfect for a variety of applications, from Arduino to Raspberry Pi projects.

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Manufacturer	HiLetgo
Brand	HiLetgo
Item Weight	0.634 ounces
Product Dimensions	0.75 x 0.55 x 0.75 inches
Item model number	3-01-0082
Is Discontinued By Manufacturer	No
Color	Green
Size	Small
Manufacturer Part Number	3-01-0082

HiLetgo315MHz RF Transmitter and Receiver Module Kit for Arduino/ARM/MCU/Raspberry Pi - Green - 3V-12V, 5V DC, 4mA, ASK/OOK Modulation, Superregeneration Receiving

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