Map of the British Isles with General Post Office radio transmitters in the United Kingdom marked. The west is at the top of the map, with decorations in the seas and at the corners. The location of the wireless stations are marked with representations of the transmission towers.
<bdi><a href="https://en.wikipedia.org/wiki/en:MacDonald_Gill" class="extiw" title="w:en:MacDonald Gill"><span title="British graphic designer, cartographer, artist, architect (1884-1947)">MacDonald Gill</span></a>
</bdi>
<a rel="nofollow" class="external free" href="https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~274051~90047766:Post-Office-Wireless-Stations,--Gre">https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~274051~90047766:Post-Office-Wireless-Stations,--Gre</a>