You NEVER want an Advantage Plan or an HMO if you're on the road a lot. Evidently you're not on Medicare with Humana as a supplement. It sounds like you bought a regular Humana Health Insurance policy. When it gets to your birthday, get off that and either use Humana as your supplement or change to another supplement and use Medicare.
I recently changed from United Healthcare because their rates got a bit high. Switched to Colonial Penn as my supplement and saved over $100 a month.