Hi Allen, she is the Danish Royal Yacht!
HDMY Dannebrog A540 - IMO 4537661
Info and photo here
https://en.wikipedia.org/wiki/HDMY_Dannebrog_(A540)
Loads more pics here
http://www.shipspotting.com/gallery/photo.php?lid=2078616
Now fitted with INMARSAT and SATTV/SATCOM so you need to make some radomes! (Kinder Surprise Eggs?!)😉
And two 30/40ft (10 or 12 metre?) HF whips at the aft end of the deck house, with antenna tuning units in the orange cylinders at the bottom mounting!
NAV and surface search radars on the foremast.
On the outboard ends of the yardarms there are two VHF IMM (International Maritime Mobile) Band antennas, Usual length 1 to 1.5 metre.
At the mast heads looks like two GPS antennas.
Two of everything for redundancy. After all it's the Kings Yachet!😉
Pic samples attached. Lovely ship 👍 Jealous 😲😉
Oh woe! Where is Britannia??? 😲
Cheers Doug 😎