The prime function of the Resistance Comms facility is to increase the amount of contacts available to you, allowing you to initiate contact with a larger number of resistance outposts. This is probably the most important facility in your base and should be constructed as quickly as possible. You should have three of those facilities as early in the game as possible - the faster you achieve it, the easier it will be to initiate contact with the resistance, allowing you to counter the effects of the AVATAR Project easier, as well as providing you with more resources.
In the late game, when you are able to upgrade your Resistance Comms, two of those should suffice - you need a total of 16 contacts to be able to initiate contact with all the resistance outposts.
Upgrades and staff influence
Resistance Communications (research)
Construction takes 16 days.
Monthly upkeep cost - 25x Supplies.
- Increases the amount of contacts you can have.
The facility gives 1 contact by default.
Additional Comm Station: allows you to fill the facility with another engineer.
Cost: 125x Supplies, 5 Power. Monthly upkeep cost - 40x Supplies.
Staff: up to two engineers, where the first one increases the amount of contacts by 2, and the second one by 4.
More information on the facility can be found in the "Base development" section of this guide.