For those who like to experiment at higher frequencies this new product of Roberto Zech, DG0VE might interest you.

The TRV10G is a all mode 70cm to 3cm transvertor that comes in 3 flavors: 250mW, 2 Watt and 4 Watt output.
It's in a metalbox, thus not waterproof, and it has an SMA output.
So you'll still need some semi-rigid coax to get to your antenna, but that's true for most Ham-projects at this frequency.

It works from 10368 up to 10370MHz but it's true range is 10350 up to 10480MHz, maximum 500mW drive power.

How about building your own smart-tuner?

This is L-C-L matching network antenna tuner build and designed by K3NG, using an Arduino

https://blog.radioartisan.com/arduino-antenna-tuner/

https://blog.radioartisan.com/arduino-antenna-tuner/

And also a video about it on youtube:

https://www.youtube.com/watch?v=SoVW1cxrKOE

I found this very interesting article on the website of G3YNH, David W Knight.

It gives an in-depth explanation on how Gas Discharge Tubes work.
One particular tube that is based on gas discharge is the Thytatron.

And as a kind of etimological revelation to me I found out that the semi-conductor known as "Thyristor" is actually coined from the combination "Thytatron - Transistor".