A:AnswerThe exact dimensions are;
Product Height With Stand
18.2 inches
Product Width
28.9 inches
Product Depth With Stand
6.4 inches
Product Height Without Stand
17.3 inches
Product Depth Without Stand
3.1 inches
A:AnswerI know it's compatible with YouTube, and you can download the app on the TV and use it. I believe you can use Fire TV with it as well.
It is WiFi internet-capable, so I would imagine you can download any of the apps that you want to use.
A:AnswerYes. If I remember correctly, they are 100 mm VESA pattern. I have purchased 7 of these TVs and they all came with M4 mounting screws already installed.
A:AnswerYou can buy a nice HD antenna from Best Buy for $25-$40. Use it indoors as close to a window as you can. The antenna is small and hides easily, not like a rabbit ears.
A:AnswerNo this tv does not have Roku built in.
What it has is Samsung TV which you can use to access a lot of the same channels as Roku but it does not have Roku built in.
On my TV I disabled the internet connection and attached an external Roku Ultra to the HDMI port on the tv.