Don't get the Devon Details any more, as it depends what the feature game is.
95.8FM and 990MW will have Exeter game, which covers Exeter & East Devon, plus 801MW covering North Devon.
95.7FM will have the Argyle game, which covers Plymouth and West Devon.
The feature game will be on all other frequencies, including 103.4FM.
How its picked is normally:
High Profile Away (e.g Pompey vs Argyle)
High Profile Home (as above)
Away game
Home game
This is split between the three Devon clubs. If all clubs are at home or away, it will be which club has had the least feature games who will get the feature match.
So tonight, Argyle should be the feature game, but don't quote me on that