You never mention how far away you are from "... Indianapolis 1070kc and
Chicago 670kc & 1000kc." That'll have a LARGE bearing on the day/night
reception question.

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
Pueblo, Colorado | @ | Jonesy | OS/2 __
38.24N 104.55W | config.com | DM78rf | SK

I'm 70mi from Indy and 120mi from Chicago. Chicago 670kc is reasonable at
night 1070kc out of Indy at night is pretty bad.
Is 40ft at right angles to these signals better that 200ft parallel?

Terry wrote:

One wavelength at a frequency of say 1070 kcs is a little less than 300
metres (approx 1000 feet?).
An antenna of either length will be very 'short' compared to the
'wavelengths' involved and will not be close to resonance.
e.g. For quarter wave resonance (approx 75 metres or about 250 feet; for
1070 kcs and nearly 400 feet for say 670 kcs ) required.
Any 'too short' antenna will be will be badly mismatched (energy loss!) to
the impedance of the co-ax.
This suggest that some kind of untuned impedance matching transformer,
suitable for the frequencies in question, might be used to transfer as
much energy as possible to the co-ax transmission line?
Seen this done with short 'whip' antenna operating at Broadcast
Band/Medium Wave frequencies.
Transmission line should also be matched at the receiver end?
100 feet of coax at those frequencies should have low loss?

any guidance on how I accomplish above impedance matching

thanks in advance
jeff