Bert Hyman wrote:
In Bill M
wrote:

I cannot afford the real air/mini-dux.

This thread prompted me to look at B&W's Web site.

The price of the real Airdux is breathtaking.

A single piece of the 1610TL (10" long, 2" diameter, 10tpi, 16 gauge
wire) that the OP is looking for is $100.

Even the lesser-rated 3027 Miniductor is a hefty $40.

http://www.bwantennas.com/coils/aduxlex.htm
http://www.bwantennas.com/coils/mini.htm

Even inflation doesn't account for those prices!
In 1967 I bought some mini-inductor stock for building a receiver
project from PE magazine. The #3016 mini-inductor was $1.03 and the
#3013 was $0.63 each. Today, they are listed on the website at $60 and
$20 each! Over a 50X increase in price! Inflation over some 40 years
wasn't THAT bad (or gas would be over $15/gal today).

Note that the web site implies that they are no longer making the coils
anymore, and that a 'special order' might be involved.