I've had PV arrays on my boat since 2001 and experimented with several configurations. Seen first-hand what works and what doesn't. Read a lot of forum threads on the subject. Would consider myself an experienced and informed user; not an expert.

1) I like to put the fuse as close as possible to the power source, in this case the PV panels.
2) Those antennas may throw a shadow on the panel and your solar output will be severely limited if even one cell is in shadow. Even the thin whip will have a significant effect. That should influence your location of the panel.
3) You won't get as much boost from MPPT technology as the proponents claim (vs. current limiting types such as PWM technology) unless your panels are for 24 volt systems or you wire two 12v panels in series. Save your money and use a PWM controller for a single 12v panel or array wired in parallel. I can recommend the Xantrex C-12, after using one for about 6 years. I'm currently using the Morningstar MPPT but with 8 panels in wired series-parallel. I don't recommend going without a controller, as I have recently read some credible tests written by Maine Sail debunking the common wisdom about not needing current limiting on small PV panels. (Perhaps he'll chime in on that).

My present setup is shown below (x2).