[GreenKeys] Giant Concrete Arrows

[Jeffrey D Angus]

On 9/10/2013 5:48 PM, Ron Kolarik wrote:
> <http://www.marylouiseclifford.com/sitebuildercontent/sitebuilderfiles/airwaysarticle1.pdf>
> It's an interesting bit of history and for the radio inclined
> among us the last image is worth a look.
By the way, that radio in the picture at the bottom....

It's an RCA IP-501 using a single 200 series vacuum tube.

More information about that in the May 2103 issue of QST in
the Vintage Radio Column.

Jeff-1.0
wa6fwi