I've got one of the 4k Samsung TV's. The RVU system still runs over coax, but has an adapter to convert that to ethernet. It's actually just the broadband internet adapter, but instead of putting internet into the DirecTV system, it's running internet (and RVU) out to the tv.
According to Western Union's website, Western Union charges a $5 fee for a standard EFT/ACH delivery and a $22 fee for expedited wire transfer delivery. There is no fee to send a check to the payment recipient.
Select Send Online. Fill out the form, and choose how you want to pay. You can either send the money with a credit or debit card, or with your bank account. The recipient can either pick up cash at a Western Union branch, or have the money deposited into a bank account.