@ Erik, the I-mast has no nav radar function, so you need separate nav radars.
on the rest I agree (although the holland class has it's HF antenna's angled like that as well, possibly to have them not interfere with the I-mast)
Are you certain about this? Northrup-Grumman's MWVR small-ship phased array surface search set advertises navigation capability as well. I don't see any intrinsic reason that a sufficiently good surface search radar could not provide nav support.