There are two Alex loops available.
One for $129 that is made of copper tubing and the ends of the tubing have
to be soldered onto the loops tuing box.
The other one is priced at over $300 with shipping from Brazil.
It is made of coax and comes with a travel bag.
I currently own both of them and yes they can be tuned by ear.
I also plan to try and use the MFJ tuing box to put between the rig and the
loop to see how easy it is to find a null.
This box is made to use to tune a manual antenna tuner.
There are two other loops available.
One from a place called the Radio S
tore in Missouri. It also sells for $300 and comes with a bag and tripod.
The other loop which is very portalbe comes from Martin Lynch and Sons in
England.
It is priced at around $38.
It can be hooked directly to the back of a Yaesu FT817ND or some other qrp
rig.
The loop from missouri has gotten great reviews on eham.
Hoe this helps,
Eric Clegg
KU3I