There are also older varactor diodes with a much larger capacitance, such
as the MVAM109 or MVAM125. There are a few sellers on eBay who have these.
I don't know if they are made anymore but there are still sources. I used
some in a receive-only remote antenna tuner I made. They have about 10x the
capacitance of the ones you are using now, and almost as large a cap ratio.

On Thu, Oct 20, 2016 at 12:16 PM, Van Horn, David <
david.vanhorn@backcountryaccess.com> wrote:

> You could use mosfets to switch in capacitors in binary values, then mayb=
e
> use a varactor or two for fine tuning.
>
> They DO still make the old 365pF variable caps, BTW.
>
>
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