I use the USB adapter thing but know due to some lawsuit they had to stop selling them.

So yeah just get a router. Unless you like having more cables.

But wireless internet uses radio waves doesn't it?

I told everybody the Wii was the best last gen console but would they listen, no. But only have an standard modem connection that takes it back to the Dreamcast era. They really need to fix a few things about this console.

A LAN adapter should cost somewhere from $20-25. You can probably a find a wireless router for about the same price if you look around and can definitely find a really good flashable one for maybe $30-50. If you're going to spend $40 to get the WiFi USB dongle, it's probably a better idea to just upgrade the router.

The Wii has an Wireless-LAN built an. Most people prefer Wireless because they don't have to use a cable and most today routers have WLAN.

Modem is wired and a lot slower analog signal.  You could also get a wired ethernet adapter for a dreamcast.  Anyways, the wii doesn't have an option for a modem.  Not sure if you are trolling, or just don't know what you are talking about?

Amazon has several to choose from $15 to $25 for the wii.

Exactly, just like bluetooth.  Actually not just like bluetooth, as bluetooth hops away and tries again, and wi-fi slows down and tries again when there is loss.

The single 22 MHz-wide Wi-Fi channel occupies the same frequency space as 22 of the 79 Bluetooth channels which are 1 MHz wide. When a Bluetooth transmission occurs on a frequency that lies within the frequency space occupied by a simultaneous Wi-Fi transmission, some level of interference can occur, causing problems for both lag in games and unresponsive controllers.

As there is measurable slowdown using a wireless connection compared to wired ethernet when the wii remotes are idle, just think how much worse it is when playing a game and moving the the wiiremotes around transmitting all that data over overlapping channels.

Well I thought bluetooth was microwaves (as in smaller wavelength than radio) but it seems if they both cross paths then WiFi must be at the very small end of the radiowaves.

Wifi also uses microwaves.  The microwave range includes ultra-high frequency (UHF) (0.3–3 GHz), super high frequency (SHF) (3–30 GHz), and extremely high frequency (EHF) (30–300 GHz) signals.   The 2.4 Ghz shared by both Bluetooth and Wifi are all relatively close.

FRACK I was gonna download FF6 on VC!