David, There is a seismic network set up in several places that use high precision GPS to monitor ground movement. JPL was involved with one of those while I was there. Of course back then the "P" code that had nearly the precision of the L band wavelength was forbidden to civilians and non-military users. So we got the same precision by using interferometery and multiple GPS satellites. Just a guess. Art -- Arthur I. Zygielbaum, K0AIZ ARRL Midwest Division Director Chair, Ethics and Elections Committee Member, Programs and Services Committee ARRL - The National Association for Amateur Radio® On 1/11/2023 9:09 PM, david davidsiddall-law.com wrote:
Any ideas about these “mystery antennas” around Salt Lake City?
I assume some sort of radio. Does anyone know?
73, Dave K3ZJ
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