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- - - Sorry this is a Revised Re-Post - - -
Thank you for your replies and now I I understand the difference between the Yagi Antenna and LPDA Antenna. But that is not the focus of my questions : A Few FM and TV Antenna Questions {Clarifications} I have seen two general types of Multi-Element FM & TV Antennas : 1 - The most common is the Multi-Element FM & TV Antenna with "Flat" Straight-Line Elements. http://tinyurl.com/3xbbfz http://www.solidsignal.com/prod_display.asp? PROD=ANC3679&xzoom=Large#xview Top View : .....Front v ----------o---------- ----------o---------- ----------o---------- ----------x---------- ----------o---------- ......Back ^ 2 - The less common is the Multi-Element FM & TV Antenna with slightly "Bent" Canted "Vee" - about 15 Degress Elements. The Tips of the Elements pointed slightly to the Front of the Antenna. See the Log Periodic Dipole Array (LPDA) Image http://www.hdtvprimer.com/ANTENNAS/G...yG.html#logyag http://tinyurl.com/2w7ssp http://www.solidsignal.com/prod_display.asp? PROD=ANCM3019&xzoom=Large#xview OK - I understand the difference between the Yagi and LPDA Antennas. MY QUESTION IS : What does the "Canting" {Slight 'Vee' Shape Bent} of the Antenna Elements Do ? ? Does it Broaden the Angle of Reception {Capture Area} of the Antenna over the "Flat" Straight-Line Elements ? ? -Or- Does it Narrow the Angle of Reception {Capture Area} of the Antenna over the "Flat" Straight-Line Elements ? ? What about Front to Back (F2B) vice Side Signal Reception ? * "Flat" Straight-Line Elements -vice "Canted" Elements ? Which has the better Front and less Side Reception ? ? Which has the good Front and fair Side Reception ? * * * New Set of Questions * * * The common Multi-Element FM & TV Antenna which has "Flat" Straight-Line Elements. # 1 - When mounted Horizontal "Flat" is very Directional with a good Front-to-Back Signal and very good attenuation of the Side Signals. Top View : .....Front v ----------o---------- ----------o---------- ----------o---------- ----------x---------- ----------o---------- ......Back ^ # 2 -IF- It is mounted Vertical {With the Tips Up-and-Down} it is still some what Directional with a good Front-to-Back Signal and now has fair Side Signals making it closer to an Omni-Directional Antenna still with some Attenuation of the Signals coming from the back-end. * A "Cardioid" {Heart-Shaped} Antenna Reception Pattern Top View : ----------- Side Front o o o x o Back ----------- Side MY QUESTION IS : Are Both # 1 and # 2 Correct ? - - - If Not - Why Not ? NOTE - OK not about Shortwave -but- It is about Antennas. i want to know -cause- iane ~ RHF |