10pcs 433MHz Antenna Helical Spiral Spring Remote Control for Arduino Raspberry 5mm

I was going to make an antenna for a project I was working on, but decided to order these. Worked great, and now I have several for future endeavors.

Did not work well with 433mhz RF modules. A short wire performs noticeably better.

Worked fine on the 433 MHz transmitter module, but almost no range on the 433 MHz receiver module (a couple of feet at best). Attaching a short wire (about 6 inches) to the top of the spiral on the receiver boosted the range tremendously.

Worked in my RileyLink :) for OmniPod

Buyer beware. These antennas are NOT tuned for 433 MHz! My measurements showed them to consistently be tuned around 408 MHz. The SWR at 433 is very high and performance will be impacted. A better idea is to just use a piece of wire that's about a 1/4 wavelength long. (Around 6 5/8")

These little buggers while not designed to work together were laid out in a star patter and soldered at their center and the line to the weather station it was to receive data for. I worked 1000% i now get all sensor data with little or no delay involved. Excellent product.

I use one of these on my DVMega hotspot and have no complaints. They come in lots of 10. I used one, gave one away, and still have 8 that I’ve no use for. Stop by my place with a dollar and take one home with you. ;)

Not for 433MHz, I would recommend a dipole antenne with roughly 17cm length.