Hi Joanne,
Great question! It looks like you have a couple of different options to get yourself ready for digital television.
Option #1:
Since both televisions are connected from a single antenna, your your first option will be to add a digital-to-analog converter box inline before the connection into the control box.
This would probably be the easiest and most cost effective option. You'll only have to purchase one converter box, and installation would be relatively easy because you can remove your coax/RF connection from your antenna to your control box and plug it into which ever converter box you purchase. You'll then have to run a coax/RF cable from the output of the converter box to the input of your control box which will plug in where the antenna input used to be plugged in.
VCR
As for your VCR, I'm guessing that you like to record shows from it? You can split the signal three ways, and have the third output connecting to the VCR. This most likely isn't a good option since you'll have to watch whatever you're recording on the two other TVs. You might want to think about purchasing a seperate converter for the VCR? If you only watch VHS tapes from your VCR; you won't have to purchase a converter box for it, since there's no analog broadcast signal.
The Con's of Option #1: You will only be able to watch the same channel on both TVs at the same time when you're receiving broadcast signals from the converter box. Also, the location of the converter box will be important, because that will be where you have to aim the remote when you change the channel.
Option #2:
Purchase three converter boxes. Ack! That sounds horrible, but you've got a lot of analog equipment to convert to digital. Choosing this route would give you the ability to locate a converter box at each TV in your RV, and one at your VCR. This would give you the freedom to watch seperate channels on each TV, and record a different over-the-air television show on your VCR.
The Con's: The cost! Even with two
$40 converter box coupons from the government, you'll have to pay for the third set top box out of pocket plus the difference in cost after using coupons for the other boxes. There's also the inconvenience of providing power to the boxes, and while I think of it, the heat from the extra electronic equipment inside your RV will be a factor too.
I hope this helped a little bit, if anyone else has any ideas as well, please post away. Joanne, if you have any other questions, let us know!