We were given this AEA Iso Loop which covers 10 to 30 Mhz. The date codes go back to 1982, and for the age its pretty good. It was really quite difficult to keep in tune. The mechanism was sloppy and needed some tender care and improvement.
There are a couple things to look for when restoring one of these. The axial play must be eliminated to keep the capacitor in a precise location. Also any gear lash must be eliminated. Watch the video to see what was done to repair this antenna.
Here's the detail of where the additional screw was placed for the motor bracket.
