Electrodepot 433 MHz Unity Gain Omni 6-Inch Antenna with Magnetic Base and Male SMA Connector Kit – 50 Ohms Impedance for Garage Gate Door Opener

The original antenna we had broke and this worked great as a replacement

I used this antenna to extend the range of my gate operator remotes that use a 433MHz signal. Before connecting this antenna, I was only getting about 25ft range (and even that was inconsistent) which was just to the end of my driveway where the gates are positioned (the control board with the receiver is mounted on the garage). I am now getting consistent reception from beyond the far side of my yard (approximately 50ft beyond the front of the driveway. I haven't tested beyond that point, so I'm not sure exactly how far the range has been extended. The length of the antenna cable was just long enough to magnetically mount the antenna to the downspout under the eve. The antenna is light and the magnetic base is strong enough to hold it securely in place even in strong wind. I did have to cut off the threaded coaxial connector at the end of the cable and strip the wire in order to connect it to the receiver. For the purpose of using this antenna to extend a gate operator or garage door signal, it is important to note that you must use the center wire (inside white insulation) to connect to the receiver input terminal and connect the outer shield wire (wrapped on the outside of the white insulation but inside the black outer insulation) to the grounding terminal. If you do not connect to the ground, the antenna provides virtually no reception. My receive only came with only a short single, insulated wire connect to the input terminal and no instructions for connecting an antenna, even though an antenna was an optional accessory for an additional $65 plus shipping; so I initially only connect the center wire to the input and had sheared off the shield wire completely. When that resulted in virtually no reception from beyond a few feet of the receiver, I decided to try reconnecting with the shield wire stripped and connected to the ground, and sure enough, reception was consistent to at least 75ft which is the optimal distance for activating the gates when approaching the driveway on the street. Saved $65 by trying this antenna rather than purchasing the more expensive option from the dealer!

increases my remote control distance

The gate at the shop had an a second controller added on, but the antenna for it was inside a steel box. The range for my remotes was horrible. This little antenna worked wonders. Had to get an adapter to fit the receiver, a few bucks, fished the antenna cord thru an access hole on the steel box, and bam! instant distance. The mag base stuck right to the steel box and all was right in the world.

What is this tiny connector supposed to connect to? Barbie house? This is so small. Liftmaster or multi code remotes have a bigger connector. I like the idea but damn.

As you can see, SWR for 433mhz is around 2... not ideal... I guess it's "good enough" for most people... but honestly, there are much better antennas out there. You could even build your own antenna that's better than this one... The cable is also pretty cheap and crappy too, I wouldn't expect it to hold up long term. The base of it is also pretty shrimpy.. But uhh, yea, if you're looking for a 433mhz antenna, I'd prolly avoid this one...

Excellent antenna. We were having issues with our gate opener, having to walk to the driveway to open the gate. Now with only one quick click (even if the control is inside your pocket) and you are inside the house, the gate opens immediately. Recommended 100%. Very happy with it. By the way, my gate it’s kind of far from the house. It works great.

I don't know a lot about radio and I certainly don't have the equipment to measure the harmonics but this is clearly not the correct length for 433Mhz. I first used a 1/4 wave whip antenna I cut myself from 22 gauge wire and was getting -27db to -40db between my two transceivers. I bought 2 of these are replaced the whips and was getting -80db to -90db from the same range. I thought I messed something up but I bought 2 different antenna from amazon (a duck one and a pack of coils) and instantly saw a 30 to 40 db increase in signal.