no idea why it behave this way. you would better contact tp-link email support.

i don't think tp-link sell antenna. You can buy dual band antenna with interface RP-SMA

can you login its web ui? when you login, go through quick setup and choose repeater.

connect a computer to TL-WA701ND, is internet working on it? if no, you need to reconfigure the Client settings on the unit. it is not connected to your Wi-Fi. if yes, check the ip settings on your...

you would better contact tp-link support so they can troubleshoot as it is related to vlan. Roman Ivanov wrote Sorry, i have TL-SG108E

where is that DHCP server? on the modem or on the existing switch? if your computer can get internet automatically from the modem without static ip or mac binding. you should be able to use deco to...