Usually an overcall bidder is less likely to attract bidding in alternative suits by his partner. The usual pattern with an overcall bid, is for the partner either to support it, or to No Bid. This is because there is already a known strong hand out against them, and bidding space is also limitted for them to explore possibilities. I have made a table for rebids by overcaller and his partner.
In this next hand, we have an opening bid of 1 Heart - from West..
Here is North's hand.
37. What should North bid on this hand?
a. 2 Clubs
b. 2 Diamonds
c. 1 No Trump