When it comes to FM transmitters, there is no one-size-fits-all answer when it comes to the best frequency. It all depends on your specific needs and application.
If you're looking for a high quality signal with low interference, then you'll want to choose a higher frequency. However, if you're trying to cover a large area with your signal, then a lower frequency will be better. Ultimately, it's up to you to decide what's best for your particular situation.
Here are some general tips to keep in mind when choosing an FM transmitter:
1. The higher the frequency, the narrower the beam width of the antenna. This means that a higher frequency signal will have less interference from other signals and will be more directional (meaning it won't spread out as much).
2. The lower the frequency, the wider the beam width of the antenna. This means that a lower frequency signal will have more interference from other signals but will be less directional (meaning it will spread out more).
3. Higher frequencies are more prone to attenuation (signal loss) than lower frequencies due to obstacles such as buildings or trees. Therefore, if you need your signal to travel through obstacles, you'll want to use a lower frequency.