What connections are required in a 3-antennae setup on an EM9291?

We have 3 antennae available with a EN9291 and there is some confusion as to which positions need to be connected. We don’t really care about data rate, favoring distance and reliability.

We were initially told we should connect ANT0, ANT1 and ANT3, but looking at the datasheet it seems more complicated.

Do we need to make any settings in !DAGFTMRXAGC or !RXDEN? Our use case is a single carrier, but we want to ensure roaming and other features work so we maximize coverage.

We are also planning to the use GPS in the future, if that affect the antennae configuration.

Also, we are using the default drivers in Fedora Core 40, so if we can use qmicli or other tools over the default wwan0mbim0 that will help our production.

according to the specification, officially commercially-deployed systems must have all four antennas enabled, so your setup already might have some potential problem with 3 antenna only.

BTW, ANT1 is for GPS, so it must be connected.
You might also need to see this table to decide which antenna to connect: