Thank you Overland and John Davies. Those are great ideas and give me a lot think about. According to the promotional materials given to me by our Oliver sales rep, the antenna is a Taoglas MK1506.AK.001, which is a low profile bolt-thru-the-roof form factor and actually has 6 cables (2x5G/4G, 3xWi-Fi, 1xGPS). I'd love to have just the antenna, but another poster here got the expected NO from Oliver on that.
I like the idea of the closet. Is the ceiling in there just a single layer of outer hull, like in the attic, or would I have to get through both the inner and outer hull?
Had not seriously considered a tall mast, but will take another look at postings on that subject.