https://www.sling.com/help/en/troubleshooting/error-messages/error-11-601
Are you using a VPN located in another country?
If you absolutely prefer wired connection the firestick has an adapter you can purchase (it doesn't work on Gen 1 firesticks). Just keep in mind it's 10/100 Speed. More than you probably need even for 4k, but technically most WiFi speeds are faster. Even with that being said, I still prefer wired even with the 'slower' speeds simply because speed isn't everything when it comes to streaming.
https://apkpure.com/roku-channel-free-streaming-for-live-tv-movies/com.roku.trc
Apkpure is a trusted site. You can side load the Roku app from here. I have it working on my device. It's perfect!!!
Ok, here is how to use more than one AirTV Black box at the same time.
Note: You can't have the same AirTV box connected to Sling and AirTV accounts at the same time.
1 - You MUST disconnect (remove) your AirTV from your AirTV account.
2 - Factory RESET the AirTV box. (paperclip in the reset hole on the back)
3 - Create a new Sling GUEST account (not same URL as a trial account) you MUST go to: https://www.sling.com/airtv
4 - Open the Sling app on your phone or tablet and SIGN OUT of the existing account. (You must use a setup capable device)
5 - Unplug your other AirTV boxes if they are on the same network.
6 - Sign in using your new Sling Guest account.
7 - Add your OTA device to Sling and scan your network for your AirTV box and follow the setup instructions.
8 - Sign out of the Roku Sling channel app and sign back in using the new GUEST account.
9 - You may have to reboot the Roku to clear the previous accounts channel line up.
To switch between AirTV black boxes you have to log out of Sling and back in to the Sling account connected to the AirTV black box you want to view.
I hope they come up with a better solution in the future. Since they only have dual tuner boxes they should allow multiple AirTV boxes per account.
For those of you that are getting the code: A-405
I know I personally was having a problem with my OnePlus device in settings up the air tv anywhere, so what did work for me was
I was able to use BlueStacks download Sling from the Google Play Store & login then in the sling app settings run the add Airtv OTA Scan no problem it must be certain devices that just don't like the air TV anywhere and my OnePlus device seemed unfortunately to be one of those that had issues with setting up my sling air tv anywhere device but I would recommend if you have any issues try what I did with the BlueStacks method.
Check if locast is in your area.
If not, first go to tvfool.com and get the distances of the towers from you. That should help tell you what size antenna you need.
As with any antenna system for VHF/UHF line of sight the higher the better. We put up a Rohn 10' tower and the TV antenna is about 15' AGL (above ground level). You can also try the top level of your house or even the attic if it is not too atrociously hot up there in summer.
We ended up getting this antenna known as a yagi. This was because some of the stations we wanted to get were over 70mi away and there are hills between us/them. After trying several antennas this was the only one that could pull in stations that distance. Even then on stormy days we sometimes lose them if it rains real hard.
That said do not skimp on the antenna. Buy the best you can afford and if possible try them out and return them if they don't work and try a larger antenna. Every situation is different and not every antenna will work well for everyone. When we lived back in Indianapolis a Mohu Leaf on the top floor was good enough to pull in all the locals we wanted.
You will come across preamps which try to amplify the signal. They also amplify noise. So if you can't pick up a solid signal they probably won't help much.