Then do like /u/psvueman says.

Make sure your TV has HDMI-CEC enabled (apparently called "Fun-Link" on Magnavox televisions).

Then add all your Vue chanels to your Vue 'Favorites'. Then use your Magnavox remote control Channel Up and Channel Down buttons to channel surf through your favorites.

If that doesn't work, a FLIRC plugged into the back of your Fire TV box will let you use any remote control to channel surf (i.e. emulate the Page Up and Page Down keys of a computer keyboard).

I started with that one but since I use my Pi for a decent amount of Video content, I later went with this combo:

https://www.amazon.com/gp/product/B07349HT26

https://www.amazon.com/gp/product/B00J4NLOOU

https://www.amazon.com/gp/product/B01MS2V7GM

The