I heard from a reliable source, that Midland plans on replacing the WR-300 with a new version, possibly the WR-330 by this time next year. Several people that I know who have bought these radios, are complaining about the same problem with a high pitch squeal on all channels after they have been in use for over a year. They just decided to replace them with First Alert or Reecom models, since the price of repairing the radio was on par with a new replacement unit.
I have an old Midland three-channel weather alert radio that I bought back in 1989, which still works very well. The only reason I never use it anymore, is because it uses the 1050 Hz tone, rather than the newer SAME technology. There was nothing I hated worse than being awakened at 3:00 a.m. for a Special Marine Warning on Lake Huron, which is 150 kilometers away from where I live. Thankfully, I don't have to go through that anymore.
Yours truly,
Ron