Yes, as long as you follow the advertising guidelines here -
http://www.eccie.net/showthread.php?t=19347
You can only post 1 ad every 7 days in the same ad forum, with no more than 5 ads in 5 different cities at a time. Your last ad was posted on 8/3 so as of yesterday you can post up to 5 new ads in 5 cities, if you'll be traveling and available in those areas.