Design and performance of a low frequency cross-polarized log-periodic   dipole antenna
  We report the design and performance of a cross-polarized log-periodic dipole (CLPD) antenna for observations of polarized radio emission from the solar corona at low frequencies. The measured isolation between the two mutually orthogonal log periodic dipole antennas was as low as $\approx$ -43 dBm in the 65-95 MHz range. We carried out observations of the solar corona at 80 MHz with the above CLPD and successfully recorded circularly polarized emission. 
K. Sasikumar Raja, C. Kathiravan, R. Ramesh, M. Rajalingam and   Indrajit V. Barve
astro-ph.IM astro-ph.SR