what are the impedance @ frequency specs for these?

I don’t know - it would be good if someone told what mix of ferrite these are made of. Then all the specs could be looked up.

Do you attach one on each end of the cable near the plug? Or just use one per cable?

I suggest you attach one on each one of the cable near the plug.

Has anyone figured out if these are type "Material 43" or is it something else?

probably something else, based upon the price.

How could I use these on a radio antenna attached to my alarm clock? Place on the end of the antenna or at the base attached to the clock?

If your antenna is a single wire, it'll choke off the signal entirely and ruin the antenna. If the antenna has a two-wire or coaxial connection at the clock, place one at the end where the antenna cable enters the clock. It'll choke off interference signals which are usually identical on both conductors (known as "common mode"), but will pass differential mode signals that go in one conductor and out the other, like legitimate signals an antenna would receive.

Brand	Mateda
Manufacturer	Ceedmon
Country of Origin	USA
Model number	FR1
Colour	Black
Item Weight	308 g
Package Dimensions	15.29 x 8 x 3.2 cm; 308 g
Item model number	FR1
Are batteries included?	No

Cedmon 20 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Cable, Black

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