which antenna is for the tv

are you talking about a 2 stick cb ant?
if so they both are cb and tv with a splitter

 

Will they work with the digital signals?

 

Usually most trucks have your antenna connection in the TV covey hole. Walmart sells a good RCA digital antenna that work good in a truck.

http://www.walmart.com/ip/RCA-Digital-Flat-Passive-Antenna/10983716


They have a better model too with a signal booster built in line but you need an inverter to plug it into. That's the one I have and it picks up 60 miles away. Near big cities it's like cable.

 

Hiya.
If the original question was about the Cascadia or Volvo OEM twin antennas, the one on the passenger's side is for the TV and be-bop radio, and the one on the driver's side is for the CB. There's a multiplexor "black box" behind the instrument panel into which they run, and then the lines to the individual devices are distributed from there after allegedly being matched for best performance.
It's not perfect, by any means. CB range for most folks is pretty poor using the stock setup. And the isolation between the two antennas isn't perfect; if you lose the passenger side antenna, you'll still get a little TV reception because of leakage from the CB side through the coupler box, but not much.

Hope that helps. I wasn't sure of the intent of the question, and mostly I hang out on the adjacent board, over at the CB section. I just noticed the "last post" listed a question about antennas, and thought maybe I could help.

If not, there's nothing lost.

Drive safe,
Handlebar

 

Quick,
The antenna itself is not specific to what manner of signal it receives. Digital and analog TV come in on the same frequencies; the ability to decode digital signals is a function of the receiver (the TV or radio) itself. If you've got a 15-yr-old 15 inch color portable with a VHS player in it (don't laugh, I've got one in my ham shack still) it won't see digital TV without a DTV set-top box, or with a cable TV or DirecTV/Dish Network receiver in front of it if I'm using one of those services. But the antenna itself will pick up anything that's thrown at it in the frequency range it's made for.
Handlebar

 

I assumed this would be the case, but the last '10 Cascadia I was in, you could see the coax y split 12 inches behind the CB connector. So, I think the CB runs the antennas in tandem. Yes there is a splitter, but the point is, if you replace only one antenna with a mismatched (from the other) don't expect very good CB performance.