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Unless the yoke was disturbed, it is probably correctly positioned. The trick is to
make sure that the waveforms feeding it are of the correct shape and amplitude.
Better wait until we can see some pictures.
As for your makeshift antenna, you can at least improve things by making it
resonant (on one channel). Find the center frequency of the channel you want
to receive (for instance for channel 7 it would be 177 MHz). Find the wavelength
in meters as 300/(F in MHz), in this case 1.69 meters. Divide by 2 to get the
half wavelength, that is 85 cm. This is the total length of your antenna (in fact
is should be a bit shorter, but if you take two 43 cm long pieces of wire and curve
the ends to fit the terminals, it should be fine).
Just attach the wires to the terminals and spread them horizontally. Be sure not
to get the wire ends in your eyes.
You might also use a VCR or DVD/VCR combo as a source, these usually output
on channel 3 or 4, but you will need a 75-to-300 ohm adapter (still fairly easy to
find as far as I know).
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