radial has two different meanings, both referring to lines which radiate from (or intersect at) a radio antenna.
The use of the radial method is more common in North America where the FCC and CRTC use it in Mediumwave transmission planning and regulation. In Europe and Asia, the use of radials has fallen out of favor since the 1970s and in many nations the radial antenna proof is only acceptable as an ancillary antenna proof. Canada and Mexico, due to lower population densities never implemented the fully complete radial models that the US FCC did.
The radial method has been falling out of favor for methods based on Cartesian coordinates. Cartesian methods require more CPU time (and memory) to compute, but are understood to more realistically represent antenna systems. The main importance of the radial methods is that a quick antenna system proof can be completed in less than 15 minutes (often in only 5 minutes) not matter how complex the antenna system is of a typical home computers CPU time.

Heading The course or direction in which a ship or aircraft is pointing or moving.
- (Aeronautics) the angle between the direction of an aircraft and a specified meridian,often due north

sa mga gusto ng number sa assignment
Vor
Describe the principles of the following
A. Intercepting an inbound track - Tune and identify the required VOR beacon and orient the aircraft to ascertain the magnetic bearing of the aircraft to the beacon. Then rotate the OBS until the required inbound track is shown in the Bearing Selector Window. The TO indicator should then be visible. The aircraft should then be turned in the direction of the Deviation Indicator on to a suitable intercept heading, which is determined from the position of the aircraft as visualised from the information available from the orientation. Closure of the required track is shown by the Deviation Indicator moving towards the central position, and when this occurs, the aircraft should be turned onto the same heading as the required inbound track.
B. Intercepting an outbound track - The procedure for intercepting an outbound track differs from the procedure for intercepting an inbound track only in that FROM rather than TO appears in the TO/FROM Window.
C. Tracking/homing directly to a VOR station - select the desired course then turn the aircraft onto the magnetic heading shown in the Bearing Selector Window and then, changing heading as necessary, maintain the Deviation Indicator in the central position. Continue flying with the Deviation Indicator central along the bearing towards the VOR beacon until the Deviation Indicator swings from side to side. The aircraft is now over the VOR beacon, and, if flight is continued on the same heading the Deviation Indicator will return to the central position and the TO/FROM indicator will show FROM.