At the moment, there is no way to increase the FOV naturally, I also don't know of any mods that would allow for it.
After doing a bit of browsing, trying to find someone else that potentially had rescued the radio spokesperson, it appears the answer is currently no.
This has come after some debate on the Reddit Just Cause board.
On one page, several users confirm not being able to find him. One user confirms having this after destroying every antennae, transponder, and satellite dish. The page quickly gets distracted after confirmation that the spokesperson is, in fact, David Tenant.
On another page, users confirm the same thing, in more detail. One user, TehBanana_, adds some clarification.
TehBanana_ posts:
IMDb only lists him as a voice, other characters that have in game models aren't listed as voice only, so I don't think you can find him. It would be great if you could though.
As confirmed, on the International Movies Database; the "Propaganda Minister" is listed as "voice only". As such, it is currently unlikely that he can be rescued, as there is no credit for the character model being in the game.
It appears odd that the minister would ask for rescue, without having any merit. It could be a joke, expected to be taken tongue in cheek; it could be eluding to future DLC content. But as such, it appears quite likely that the minister can not be rescued in the current game.
Best Answer
While liberating a base big enough, Annika might tell you that she is sending in rebel support. She will tell you to do a task, like hack all the SAMs for air support. You cannot call in rebels, but she will usually offer this support for big bases once you destroy about 1 to 2/4ths of a base. The rebels won't destroy chaos objects, but they will attack any form of militia, giving you cover.