3D plot in Rinearn3D from Alex Pettit 13-element 1420 MHz Yagi at LRO clearly showing two spiral arms 0-90 degrees longitude (data up to 5/6/2025)
astronomy.network The Website of Lichfield Radio Observatory (LRO)
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net