General Antonyms:
* Attract
* Draw
* Charm
* Entice
* Allure
* Fascinate
* Captivate
More Specific Antonyms (depending on context):
* Embrace (emotions)
* Accept (ideas)
* Welcome (people)
* Admire (beauty)
* Approve (plans)
The best antonym will depend on the specific context in which you're using the word "repel."