[NAME, COMPANY AND ADDRESS, ex.
John Smith
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]
 

Dear [NAME, ex. John Smith], 

We are interested in producing and running a television advertisement [TIME PERIOD, ex. during September].  The expected duration is [DURATION, ex. 30 seconds] and we plan to run [X] spots in the [TIME OF DAY, ex. early afternoon period].

I would greatly appreciate it if you would call me at XXX-XXXX to discuss the services you provide and your advertisement rates. 

I look forward to speaking with you.

Sincerely, 

[YOUR NAME, ex. Jill Jones]