Question: antennas that transmit an equal amount of energy in the horizontal direction are called
[{'answer': 'omnidirectional antennas', 'provenance': [{'wikipedia_id': '187317', 'title': 'Antenna (radio)', 'start_paragraph_id': 2, 'start_character': 203, 'end_paragraph_id': 2, 'end_character': 227, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '187317', 'title': 'Antenna (radio)', 'start_paragraph_id': 2, 'start_character': 102, 'end_paragraph_id': 2, 'end_character': 515, 'bleu_score': 0.79581577028172, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13942302844543145201}, 'section': 'Section::::Abstract.'}]}]