Editing 'Pre-defined muxes'

How do I change 'Pre-defined muxes'?

There isn't an optimal option for me?

How do I find the nearest terrestrial transmitter to me?

If you installed from deb package all the pre-defined frequency info should be in
/usr/share/tvheadend/data.

You can just create manual muxes and enter in frequencies if no predefined ones are available.

To find what is near to you you'll need a scanning app.....

updateDVB works excellent for ATSC with some of the Hauppauge tuners. DVB-T I'm not sure what works.

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Tvheadend