(How would I check if it's transmitting at 5 GHz?)
The iPhone can see the extender except whenever I try to connect it just constantly tries to connect and never actually connects. I use Netgear and the extender is also by Netgear it's called the Universal WiFi Range Extender WN2000RPT. I've tried rebooting the extender multiple times and each time it didn't work, however I just tried it again and my iPhone finally connected, which doesn't make any sense because I didn't do anything different. Maybe there's a problem with the extension? I've found multiple times that it gets screwy at timesthere are three icons with lights on the device one with arrows going up and down, another with something that looks like a computer with waves coming off of it, and a third with range bars; sometimes that third icon glows red or orange after staying green for a while as if it can't withstand transmitting for more than a few days. I don't understand why it keeps doing this.
But even so, even when I rebooted the extension yesterday it didn't work. So I'm rather confused about what's going on.