A modular RF apparatus includes an RF portal and an RF expansion module configured to be coupled with the RF portal. The modular RF apparatus is configured to expand the number of outputs of the RF portal by adding the RF expansion module in a manner that minimizes an increase in the spatial footprint of the modular RF apparatus while allowing easy access to all ports of the modular RF apparatus. The RF portal and the RF expansion module are configured to interlock to create an integrated functional block. The modular RF apparatus are configured to permit upgrading of the RF portal by adding the RF expansion module without disrupting existing connections to the RF portal.