A fast, far-sided halo CME was observed beginning at 04:36 UTC on 23 July in coronagraph imagery. The event originated from old Region 2665 (S06, L=111) which was responsible for two M-class flares during its rotation across the visible disk. The imagery above shows the event as seen from the NASA STEREO A spacecraft (left and right images) and the coronagraph on the NASA SOHO spacecraft (center). This CME is on the opposite side of the Sun and will not be geoeffective.
Loop antennas are a favorite among hams. They are a simple design and offer more gain than a half wave dipole antenna. A full wavelength loop antenna can have as much as 2 db extra gain over a dipole when compared at a similar heigh A loop... Read more