Review on 📡 Bingfu WiFi Antenna Extension Cable 2-Pack - RP-SMA Male to RP-SMA Female Bulkhead Mount - 3m 10ft RG174 Cable for WiFi Router, IP Camera, Network Card by Unm Weil

I need to extend my WiFi antennas about 15 feet off the ground, I have a cave in an old bomb shelter underground about 50 feet from home where the router is, I'm using a WiFi 6 ROG -NIC and an AX11000 ROG router and my signal strength is around 30% at 480Mbps, with my laptop next to the router with Wi-Fi 6 NIC my speed is around 800/Mbps so I'm trying to see if i can reach this speed as cheap as i am still missing a wifi 6 repeater, so i tried to extend my antenna over the ground because my laptop on the bunker is losing about 650/mb. but these extensions reduced my signal by 8%, causing me to lose about 20/Mb. Now I just have to wait until I can afford a WiFi 6 extender.