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The length of the antenna required to transmit a signal is related to the wavelength. Directly transmitting frequencies in the audio range would have long wavelengths requiring a humongous antenna and lots of amplification.

You're referring to MHz, the frequency band that reserved for public broadcast FM radio, the band varies between countries but it's usually 86 - 108MHz. Frequencies outside that spectrum are reserved for other services, for example those just above it are used for commercial aviation communications.

In the AM band, each AM station has a maximum bandwidth of 10 kHz, extending 5 kHz above and 5 kHz below the assigned center frequency. The AM band in the United States covers frequencies from 540 kHz up to 1700 kHz, in 10 kHz steps (540, 550, 560 ... 1680, 1690, 1700).

Below this is reserved for television stations. Radio waves would interfere with television waves, hampering communications. However, the FCC will allow radio broadcasts to produce transmissions lower than 88.1 MHz if the carrier wave does not go farther than about 60 meters.

The power output (watts) of the radio will determine if you need an FCC license. Two-way radios that are below 2 watts can be used license free. License free, low powered radios are used for short range communication typically 0.5 to a few miles. Any radio above 2 watts will require an FCC license to operate.

To do so, you must obtain MIB's consent (Ministry of Information & Broadcasting, Govt. of India). Except for the MIB, no one else has the authority to grant this license. You can begin your broadcast on the frequency once you receive the WPC's final approval (Radio FM).

Please be aware that unlicensed operation of radio broadcast stations is prohibited, even at low powers such as 1 watt or less. The only unlicensed operation that is permitted on the AM and FM broadcast bands is covered under Part 15 of the FCC's rules, and is limited to a coverage radius of approximately 200 feet.