RF exposure evaluation is the method used to evaluate the RF field strength levels generated by a device.

The FCC has recently changed its RF-exposure rules, eliminating service-specific exemptions from the need to do a routine RF-safety evaluation and replacing those exemptions with a formula that applies to all radio services. See the FAQ on the ARRL RF-Exposure page for more information. The rules did not change the exposure limits nor the two-tiered exposure environments for controlled and uncontrolled exposure. The controlled limits generally apply to amateurs and members of their household if those people have been given instructions by the amateur about RF safety. The uncontrolled limits apply in all other circumstances, such as exposure to the general public.

To use the RF Exposure Calculator, fill-in the form below about your radio, cable, and antenna. Depending on how far above ground the RF source is located, you might want to consider ground reflections — and then click "Calculate."

You may need to run the calculator multiple times to get a complete picture of your situation, i.e. take into account the antenna's lobes and directionality.

For more information about the gain of your antenna, ARRL has an excellent article explaining it.
Click here to open that page on ARRL's website.

Looking for coax loss information and a calculator?
Here's an excellent page on QRZ that will be useful.

If you'd like to see or download the 316 page document from ARRL about RF Exposure and You, you'll find it here. Below that is a video on RF exposure rules. Here's the link to the document to make it easier to download.