[Antennas] increased antenna bandwidths through a tuner, why?

[Harvey&Bessie]

Sam Morgan wrote:

> I have a bugcatcher set with 1:1 at center frequency of 7.09 with no 
> tuner.
> It has a base coil taped for minimum swr.
>
> When I check the 2:1 to 2:1 bandwidth it is about 76kc.
>
> If I run it through my home brew T-tuner, and set the tuner to have 
> the same 1:1 at that same 7.09 frequency, I then get a bandwidth of 
> 151kc. (not touching up the tuner further than when I set it to 1:1 
> initially).
>
> The tuner is set with both caps @ 50% and the (small) roller inductor 
> is set at about 7 of 17 turns out from minimum inductance.
>
> It makes me happy, sure, but I'm wondering if someone would explain it 
> to me.
> How does it increase the bandwidth if the same 50ohm feed point is 
> there with or with out the tuner.

The increase in bandwidth is undoubtably due to added losses,.
Harvey/W4TG