That always makes me laugh a little.I just set up my first round of direct mail postcards (1,000) to absentee owners with properties scattered throughout the Honolulu county.

Send the owners a postcard or quick note. 

For example, you might do better with a professional postcard to absentees, rather than a "My wife and I want to $BUY$ you house" yellow letter.Absentees are generally landlords and people who inherited houses.  

Assume the lead came via a postcard, and the owner called me.

Every 1k postcards you send you should get about 15 calls / 5 serious.

Hey wholesalers,I am on the verge of sending out my first direct mail campaign to about 1500 people via post card and I am trying to determine what phrasing I should use on my postcards.

Do you find letters or postcards work best?

Perhaps, you can send postcards monthly and just remind him you're an option if he's willing to come down on price.

Postcards?

He has invested a lot of money into direct mail post card marketing.