Impalas.net banner
1 - 9 of 9 Posts

·
Registered
Joined
·
65 Posts
Discussion Starter · #1 ·
I need help finding templates for both right and left rear dual antenna holes for a 66 impala. Any help is very much appreciated.
 

·
Registered
Joined
·
1,131 Posts
Antenna

Dual antennas were never offered in a 66 full size car by factory or dealer but perhaps an aftermarket shop may have a template.

Paul
 

·
Premium Member
Joined
·
13,149 Posts
But it was a custom up grade to a lot of full size convertibles of the era back when FM first started broadcasting. You use symmetry to find the second hole location as it will be in the exact same location (as noted on the template in terms how far it is from what) only flipped to the other side of the car. So you just have to locate the first hole (which from memory was on the passenger side).

The second antenna is a dummy as you only connect one antenna to the radio for reception.

Big Dave
 

·
Registered
Joined
·
65 Posts
Discussion Starter · #5 ·
But it was a custom up grade to a lot of full size convertibles of the era back when FM first started broadcasting. You use symmetry to find the second hole location as it will be in the exact same location (as noted on the template in terms how far it is from what) only flipped to the other side of the car. So you just have to locate the first hole (which from memory was on the passenger side).

The second antenna is a dummy as you only connect one antenna to the radio for reception.

Big Dave
Thanks. So all you need is one template and flip it for the left side?
 

·
Registered
Joined
·
1,131 Posts
Antenna

Also keep in mind that rear antennas were not offered with an AM/FM radio in 1966 due to poor reception

Paul
 

·
Premium Member
Joined
·
13,149 Posts
Dual antennas are a CB thing. If you have two antennas broadcasting (not receiving) on the same frequency side by side the signal bounces off of one to be redirected at an angle which can be used to amplify the strength of the signal in a straight line (like going down a road, or from a small AM station wanting to broadcast into two major cities when it is limited to a small coastal town far from the market they want to reach).

When receiving you need the tallest antenna you can find that is tuned (by length) to be a multiple of one forth the broad casting frequency. It can be a quarter the wave length as in those 8.5 foot (102 inches) tall CB antennas on big rigs or a 52.33 foot tall antenna to get perfect AM reception on your AM radio that uses a one to ten Kilometer wave length. But no mater if you need some thing a bit shorter to get your car through the car wash or not, you only need one antenna, not two.

Here area couple of engineering texts that are for sale to cover the theory used by radio and TV industry (back before cable, and podcasts on the internet):

https://www.sciencedirect.com/topics/engineering/antenna-length

Big Dave
 
1 - 9 of 9 Posts
Top