Astrometry B-V stars:
http://www.physics.udel.edu/~jlp/classweb/
Skyview Virtual Observatory:
https://skyview.gsfc.nasa.gov/current/cgi/titlepage.pl
Skyview Query Form
https://skyview.gsfc.nasa.gov/current/cgi/query.pl
Omni directional dipole antenna
https://www.secantenna.com/omni-dipole-antenna.html
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