TWAYRDIO Yagi Antenna UHF 400-470Mhz,High Gain Outdoor GMRS Vertical Base Antenna,7dBi Receiver Directional Yagi for Ham Radio,Repeater System,433mhz Device,Fm Scanner

Works great 😃 ,made 1 small adjustment to gamma and swr is perfect -for the price, excellent antenna

Very easy to setup, weighs almost nothing. This antenna would be nice for POTA/SOTA on UHF. I actually bought this mostly to get me into a nearby GMRS repeater. I am on the backside of a a hill blocking most of the signal. With good coax I could hear the repeater just fine, occasionally kerchunk it but no one wants to talk with someone they can barely hear. I tried with a N9Taxlabs slimjim, Tram 1126, Tram 1173. With the extra directivity this was finally able to get me onto the GMRS repeater which is about 20 miles from my QTH with full quieting. Biggest hangup is the manual isnt written perfectly doesnt go into tuning. To tune you slide the gamma match (see close up) up and down and tighten with an allen wrench. The bandwidth seems a bit wider than what I expected so it should be pretty easy to re tune for the amateur band or other purposes in this area of the bands.

I bought this antenna to use as a Vertical to use with a 433mhz Gate Opener. I needed to boost the 433 signal that was limited to 800 feet Line of Sight under power lines. Metal in close proximity (such as a metal mast does affect the tuning To tune there is an adjustible block that induces signal onto the radiator . If you mount the block at the end of the shrink tubing it will be near 433mhz and be quite low to 425mhz. the best way to fine tune is in-situ mounted on a 1.5 inch PVC Mast at the height you'd like to use. then use a tuner to adjust the tuning block. I suggest building the antenna on you kitchen table. This antenna has 2 tiny set screws and 3 Phillips screws to secure the aluminum Reflector, Director and Radiator Elements to the Square frame. Make sure the Screws are tight keeping the Radials tight. There should be no movement of any parts of this antenna. The instructions are good. It has a potential Gain of 9 decibels. a 3 decibel gain doubles the signal size. The Vertical Beam With is 45 degrees which is excellent - Not too narrow. If tuning is critical you will accomplish 1.4 SWR but you will need to tune IN-SITU with the cable employed for you use. 50 ohm cable is best. RG-6 will work but the SWR may be higher. Point the Antenna in the transmitter direction and secure to mast before testing. The use of a Comet or other antenna analyzer 433mhz capable meter is suggested for the most accuracy. If the gain is not enough , consider the 11DB Gain version of this antenna. This antenna will Transmit and Receive with most Remote 433mhz Remote Control, 70cm Ham Radio, GRMS and Weather Radio. Receivers 400-470mhz See specs for details.

This is a great Yagi, power handling and frequency range are perfict for many ham radio projects such as links or base to repeater applications. The only week point that I see, is the small screws to hold the elements to the boom. If you have rivets available, I would use them insted of the small screws. Other than that, it's a great product for home use!

Initial review: Antenna is easy to build, easy to tune. Kind of a mid quality item. I wonder how water proof it is, we'll see how long it lasts in the weather. I'll update after I use this for a while. Update: I've been listening around the channels and have heard stores that use FRS walkie-talkies four miles away from me. It definitely will cover the neighborhood.

I purchased the UHF 400-470Mhz single band version. I am working towards getting my technicians license and have been listening to local repeaters with a Baofeng and a Nagoya NA-771 antenna. Then I found out how to listen to a repeater on the ISS. With the Nagoya I could get a signal for 2 of the 10 minutes when the ISS was directly over head. With the directional UHF Yagi Im able to get a signal for most of the 10 minutes on a low pass that hugs the horizon. Just wave it around in the general section of the sky you expect the satellite, with the desired frequency (may want to adjust accordingly for doppler during the pass) and I got an incredibly good signal. I paired it with a 3foot UHF male to BNC male piece of coax, a BNC female to SMA female adapter for the Baofeng for quick disconnects and some bicycle handle bar tape. Pretty slick little piece of kit for so cheap! Not perfect though; it’s priced low because it’s made cheaply. It’s all aluminum tubing and once assembled is sturdy enough, but the metal is too thin to repeatedly unscrew, breakdown, then reassemble. It wouldn’t last too many cycles of that. Also be careful witg the set screws on the slide block when tuning the antenna, I stripped one of them.

1. One of the set screws in the tuner bar was stripped from the factory. Could not fasten tuner bar. 2. The rivet that mounts the feed line bracket stuck out far enough to block insertion of the driven element. 3. Director element mounting hole was off center, making one side slightly longer than the other. I do not know if it was enough to affect performance because of the other issues preventing assembly.

Works