A few days ago I purchased a refurbished Dell i5 desktop. The desktop came with16 gigs RAM, 512 SSD, and included a 802.11n WiFi adapter. When I check my WiFi status speed on the Dell w/ Windows 10 it reads 144 Mbps. Also, I have a HP i5 laptop which is brand new, it has 16 gigs RAM, 512 SSD and 802.11ac integrated WiFi (purchased last year). When I check the WiFi status on that it reads 72 Mbps. When I plug in a 802.11ac antenna ( AC 1300 Mbps USB 3.0 WiFi adapter, eternal antenna ) into the laptop it jumps to 144 Mbps. My confusion is why is the desktop's 802.11n speed faster than the laptop's 802.11ac speed, w/o the antenna. My router is one of those Spectrum Community routers that they install in an apartment complex, I don't know if it is 2.4Ghz or 5Ghz, I can't access thru my browser. I know that the 802.11n should be 150 Mbps and the 802.11ac should 433 Mbps ( in theory, of course.) FYI: Yesterday, I inserted my 802.11ac antenna into the desktop while the the 802.11n was plugged in and the Mbps when up to 400 Mbps, when I tried a 2nd time didn't repeat LOL. Anyway, I would appreciate it if you could clear up my confusion.