So I'm setting up a Roku stick on my TV that is at the other end of my house from my router. The router is a TP-Link Archer C9. Sort of a budget-y model. The Roku stick setup for networks said that the 5.0 network signal was not strong enough for a reliable connection. I was able to get a good-enough signal on the 2.4 network (https://hardforum.com/threads/2-4-guest-network-stronger-than-regular-2-4-network.1981727/) but we're planning to buy a 4K TV probably in a few months, and I'm thinking that a 2.4 network can't stream fast enough for that 4K TV. I also don't like using the guest network because then I can't use one of my PCs to send videos to the TV. If I spent some serious bucks for a WiFi router, would I get a stronger 5.0 signal? Any recommendations? I picked the TP-Link because of strong security, and that's a consideration for me for a new router?