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May have to look at this from a view point of resonance.

If the gain master is a 5/8 wl ( I dunno never looked at it) then it uses a matching network to get the impedance to 50 ohm.

By adding a 5% bigger reflector that reflector will need to be resonant 5% lower in frequency than the driven element ( gainmaster ).

Also the director will need to be resonant 5% higher in frequency that the gain master.

So just by adding some tubing 5% longer and 5% shorter is not going to work if the driven element is a 5/8 wl.

That is why most yagi's are either 1/2 wl driven elements or full wave length quads.

Exceptions to that are trapped yagi's and that is a whole nother ball game.

[QUOTE="wavrider, post: 351520, member: 9893"] May have to look at this from a view point of resonance. If the gain master is a 5/8 wl ( I dunno never looked at it) then it uses a matching network to get the impedance to 50 ohm. By adding a 5% bigger reflector that reflector will need to be resonant 5% lower in frequency than the driven element ( gainmaster ). Also the director will need to be resonant 5% higher in frequency that the gain master. So just by adding some tubing 5% longer and 5% shorter is not going to work if the driven element is a 5/8 wl. That is why most yagi's are either 1/2 wl driven elements or full wave length quads. Exceptions to that are trapped yagi's and that is a whole nother ball game. [/QUOTE]

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