@Pouchey 

Exactly the same, this gives me the 2.4Ghz 574Mbps link speed in AC mode, but when I switch it to AC/AX mode the link speed drops to something silly lijke 232, so this isnt anything to do with poor signal, its the device and its firmware. And my router is WIFI6, setup correctly.
I bought this for the same reason as I can get over 1000Mbps with my 5G LTE router and external antenna, but it only has a gigabit LAN port so I can't exploit any speed over 1Gbps. I even have a TPLink WIFI7 Dual-band, (not Triband) brand new unopened router, which I bought simply as it has a 2.5Gbps LAN port, as does my Mini-Pc.
So I already have my existing interal Intel AX120 WIFI6E AX M.2 card inside my Mini-Pc, even that is able to get a link speed of 1.2Gbps.

Obviously the advantage of this dual "high gain" antenna USB WIFI adapter is that it SHOULD, with the supplied extension cable, plus I've used a USB 3.0 female to Male to give it about 2M+ of cable, this allows me to stick it in an ideal position on the top of one of my loud speakers.

So the internal antennas on my PCs WIFI card are also 2x2 MIMO and support 160mhz, I'm pretty sure this doesn't support 160mhz 5ghzwidth frequency either. But chances are the antenna inside my Mini-PC are only 2x 3-5dBi.
So the purpose of buying this thing, is that its positioning is far better, also in a USB 3.0 port. And although it does not state the dbi of the dual high gain antennas, i'd expect them to be higher, plus they are not low down within a PC so the signal strength has to be significantly higher. My Router is only about 7M away and no walls to go through, even testing this right next to my router, didnt change a thing.

And this is so stupid as they do a very similar looking upgraded Tri-band WIFI6E Tri-band model capable of total 5400Mbps. But it has the exact same dimensions, near identical appearance its just a bit darker grey. So if my TX50UH cannot even get a link-speed over 574Mbps, thats in AC mode. In AX mode it decreases, when it should increase.

I have not heard any good reviews on any of these line of products, and those below them. Only from people who have a total internet speed/download of less than 200Mbps, are happy with it, for obvious reasons. But to pretend that either of these models, on 5Ghz only could get anywhere close to 2400Mbps, or whatever the near identical £15 more expensive model can get on either 5Ghz or the 6Ghz band.

Firstly the network adapter configuration options are significantly more basic than my 3 year old Intel AX120 WIFI6E 160Mhz M.2 card. Which by the way, you can buy it for about £15, and even within my PC with the same 2x2 MIMO, almost certainly both lower Dbi gain antennas, and with its positining inside a Mini-PC. How can my Intel WIFI6E card outperfom this thing which is sitting almost 160cm high in the air, clear from any inteference. My network is optimised for no interfere, I often have my PC's WIFI off altogether, unless I'm getting over 1000Mbps which the routers Gigabit LAN and 15m of high quality Cat 7 cable, bottlenecks.

There is some issue with the ver 1 driver, its configuration and abaility to connect to WIFI6 networks in AX mode, and tbh looking at it's design. It looks good, but you can get legit pair of 8 DbI large Bunny ear antenna, not the cheap/fake ones. So looking at this thing, since they havent stated anywhere this "high gain" dbi dual antennas anywhere, I am confident its maybe 2x 5Dbi or something. I like the fact that this adapater looks modern and stylish, but with its thin design I don't think this has high gain antennas at all, just average. And in the AX5400Mbps model which is identical? No chance they have somehow put even strong antenna in there, they both use the same USB 3.0 power output, so why advertise that either model can get combined AX3000Mbps with TX50UH, or ridiculously high 5400Mbps Triband with combined 2.4Ghz, 5Ghz or 6Ghz to choose from.
That thing cannot support anywhere close to 2400Mbps on 5Ghz or 6Ghz.

My mistake, the TX70UH is actually WIFI7, not that it matters but priced at £48:  TP-Link Archer TXE70UH Wi-Fi 6E 5400Mbps USB WiFi High Gain Antennas USB 3.0 WPA3 OFDMA MU-MIMO - Yet it cannot even match a £15 3 year old M.2 Intel AX120 WIFI6E 160Mhz, inside a Mini-PC. 

I've contacted support and they were very polite, but they were asking me very silly troubleshooting questions, as you would to someone who doesnt have any IT/technical/networking knowledge. The outcome of that was they sent me a templated tips and hints troubleshooting guide, ignoring all of the specific information and many screenshots I have them, very condescending stupid trouble shooting questions.

So this will be returned, there are other branded similar long cable WIFI6E Antennas out there that also claim AX3000 or AX5400Mbps Triband. I will try one of those, this thing isnt fitfor purpose, it cant get me above 232Mbos Link speed on  2.4Ghz either by the way.

Since these antennas are designed for those over us with over 1Gbps, designed to exceed that of our PC/Laptops internal WIFI card, by spec and design. These are absolutely pointless. Even sticking the thing right next to my router makes no difference, I wasnt expecting the full 2400Mbps but in my scenario, with no walls, distance or interference. The description and specs say this should easily exceed 1500Mbps link speed with optimum signal strength and positioning.

I will be returning my TP-Link WIFI 7 router also, even though I could try it in bridge-mode and its powerful enough on paper to easily exceed 1Gbps over WIFI, and its 2.5Gbs LAN port - since I was going to use it for full fibre 1.8Gbps. But at close range with no walls it doesnt take a super expensive dual band, even WIFI5/6 should easily go 2Gbps, especially a WIFI7 with 4x large antenna, in a small flat, perfect conditions. Even all my 2.4Ghz, 5Ghz bands are non interference cross-over, and I had a dedicated external Bluetooth 5.4 adapter that is specifically designed with protocols to monitor, detect, and switch nodes to prevent 2.4Ghz/Bluetooth interference.