Motorhome tv wifi

We also have an Avtex TV that's not 'smart' (Series 7).  I use a Firestick and it works brilliantly.  Plugs into the back of the TV and takes its power from one of the built-in USB ports so you don't even know it's there. 

Prior to that I tried Chromecast and found it next to useless - very clunky and half the time I couldn't get it to 'cast' programmes from my phone. Certainly wouldn't recommend it.

Only slight downside with the Firestick and your non-smart TV is that you will have to use two handsets.  The volume can only be controlled from the TV handset - not the Firestick one.  But when all said and done that's no real hardship!

I use a TP Link router connected to a Poynting external aerial and it works perfectly.

Hope this helps.

I have also used a firestick to good effect. You will be able to receive all the most popular channels.  My WiFi is an old smartphone, on EE, to which I tether the firestick and have never had any problems,