Howard,
I operate horizontal loops of quite a few different types ( plain,
crossed, tilted,...) , although not as large as yours.
They are great! Called See L.B.Cebik (W4NRL) if you haven't already
at :
http://www.cebik.com/fdim/atl1.html One has it for all bands.
They radiate at low angle the higher the frequency and are cloud
burner if not large enough ( if perimeter below abt 2 lambda).
Nevertheless they are also surprising. At dawns or darkening in
evenings ...
Now to your question and my recommendation: take a tuner running 160M
as well and really do not open the loop but keep it closed !
I do so and my loop ( 100M only of wire loop but crossed with some
vertical delta portion in it I know a bit too short- but
whatever! ) is tuned with a MN7 on 160M and runs fine , although not
dxing strongly because of sky beaming. .. except those surprises
during evening or morning windows well described in John's book
( ON4UN) on " Low band DXING".
Hope I helped.
Good luck and 73's.
Pierre.
F3WT
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