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Don't get a directional microphone, they're directional and won't be very useful in a lecture hall or clasroom setting unless you're willing to constantly adjust its focus by swiveling the mic around, and still won't help much with the range.
they're meant to exclude anything not directly in its line of audio rather than to extend range.
You're on the right track with a conference style mic If you want to record everybody, although you will lose clarity of your professor's voice compared to the lavalier, get a Yeti omnidirectional snowball style, or the digital voice recorder someone else suggested will work also.
depending on the size of the room, even the omnidirectional mic won't work for students and the professor.
no matter what the microphone is, there's no way to get clear audio of both your professor and a student in the back of the room with one microphone.
The lavalier you're using is best for recording your professor. with any microphone not right next to them, recording quality is going to lose clarity.