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Here are some of the regulations from CFR 47 Ch. 1 (10-1-89 edition)
Part 15.


15.209  Radiated emission limits; general requirements.

  (a) Except as provided elsewhere in this subpart, the emissions from
  an intentional radiator shall not exceed the field strength levels
  specified in the following table:

  Frequency		Field strength		Measurement distance
  (MHz)			(microvolts/meter)	(meters)

  0.009-0.490		2400/F(kHz)		300
  0.490-1.705		24000/F(kHz)		30
  1.705-30.0		30			30
  30-88			100			3
  88-216		150			3
  216-960		200			3
  Above 960		500			3


15.219  Operation in the band 510-1705 kHz.

  (a) The total input power to the final radio frequency stage
  (exclusive of filament or heater power) shall not exceed 100
  milliwatts.

  (b) The total length of the transmission line, antenna, and ground
  lead (if used) shall not exceed 3 meters.

  (c) All emissions below 510 kHz or above 1705 kHz shall be attenuated
  at least 20 dB below the level of the unmodulated carrier.
  Determination of compliance with the 20 dB attenuation specification
  may be based on measurements of the intentional radiator's antenna
  output terminal unless intentional radiator uses a permanently
  attached antenna, in which case compliance shall be demonstrated by
  measuring the radiated emissions.


15.239  Operation in the band 88-108 MHz.

  (a) Emissions from the intentional radiator shall be confined within
  a band 200 kHz wide centered on the operating frequency.  The 200 kHz
  band shall lie wholly within the frequency range of 88-108 MHz.

  (b) The field strength of any emissions within the permitted 200 kHz
  band shall not exceed 250 microvolts/meter at 3 meters.  The emission
  limit in this paragraph is based on measurement instrumentation
  employing an average detector.  The provisions in 15.35 for limiting
  peak emissions apply.

  (c) The field strength of any emissions radiated on any frequency
  outside of the specified 200 kHz band shall not exceed the general
  radiated emission limits in 15.209.

  (d) A custom built telemetry intentional radiator operating in the
  frequency band 88-108 MHz and used for experimentation by an
  educational institute need not be certified provided the device
  complies with the standards in this part and the educational
  institution notifies the Engineer in Charge of the local FCC office,
  in writing, in advance of operation, providing the following
  information:

  (1) The dates and places where the device will be operated;

  (2) The purpose for which the device will be used;

  (3) A description of the device, including the operating frequency,
  RF power output, and antenna; and

  (4) A statement that the device complies with the technical
  provisions of this part.


There are additional bands for which exceptions to 15.209 exist.  They
are summarized below.  See CFR 47 for special restrictions applying to
the use of these bands.

Frequency	Fld. strength/	Meas. Distance/	FCC	Primary or
(MHz)		Input power	Antenna length	Par.	Designated use

0.16-0.19	1 W		15 m (antenna)	15.217	Hobby (Lowfer)
0.510-1.705	100 mW		3 m (antenna)	15.219	AM Broadcast
1.705-10	100 uV/m	30 m		15.223	Spread spectrum?
13.553-13.567	10 mV/m		30 m		15.225	?
26.96-27.28	10 mV/m		3 m		15.227	CB
40.66-40.70	1 mV/m		3 m		15.229	Cordless phones
49.82-49.90	10 mV/m / 100mW	3 m		15.235	Toys, cordless phones
72-73		80 mV/m		3 m		15.237	Auditory assistance, RC
75.4-76.0	80 mV/m		3 m		15.237	Auditory assistance, RC
88-108		250 uV/m	3 m		15.239	FM broadcast
174-216		1.5 mV/m	3 m		15.241	Microphones?, TV 7-13
890-940		N/A		N/A		15.243	Spread spec., VCR xmtr?

My photocopy of the regulations ends just after the beginning of
15.243, so I can't provide any information about the 890-940 MHz or any
higher band.
-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
bill@tv.tv.tek.com, ...!tektronix!soul!bill               Phone: (503) 627-6920
"How can I prove I am not crazy to people who are?"