Help with Netmetal 5

Hi brand new to Mikrotek and router OS so learning please be patient

My Netmetal 5 just arrived in the post with a big warning label saying do not power up without an antenna connected.

I don’t have any antennas as I only wish to use this as LTE to LAN.

The only antennas I have are off a Netgear R7000 will these do??