Short answer is yes.  MA-ANT-21 is for 5GHz band MA-ANT-24 is for 2.4GHz band   2x N-Type antenna ports are located at the top of the MR72 and 2x are located at the bottom of the MR72. The pairs of antenna ports each correspond to the 2 client serving radios. The spectrum that each pair serves is printed on the shell of the MR72. https://documentation.meraki.com/MR/Installation_Guides/MR_End_of_Sale/MR72_(EOS)_Installation_Guide     ... View more

Running firmware 14.38.   Problem solved. It was my silly mistake. When I configured the WAN IP on the second MX84, I forgot to change the subnet mask's host address from .0 to .248.   Since the public static IPs at the two sites happen to share the first three octets, the second MX wasn't responding to the VPN connection from the first one.   Lesson learned. ... View more