The Eachine RC832 is a 32 channel receiver from Banggood. It is able to receive F, E, A, and B channels. If you want to fly more than 3 pilots at a time, some pilots are going to have to get off of the standard FatShark channels. The Boscam E frequencies reach below and above the FatShark channels which allows for the additional pilots.
Using a video cable, between the receiver and your FatShark goggles allows for you to view channels not normally accessible by Non-Dominator FatShark goggles. Also, by using a cable, multiple pilots can use the same receiver in different races.
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You can get your own here:
Eachine RC832:
MultiGP Frequency Cards:
Quanum V2 Goggles Review: