If I were making a delta loop antenna I'd cut the wire
37 ft. 6 inches, which is too long for 27.205 Mhz.
I'd buy a 6' RG59 A/V cable from Home Depot, etc, and 2 of these adapters -
[ATTACH=full]21382[/ATTACH]
And put the RG59 jumper between the antenna and 50 Ohm coax.
To take SWR readings I would use a RG58 coax section connected to the SWR analyzer end of your RG59 (75 Ohm) jumper that is cut 11' 6" long, or exact multiples of that length - x2=23', x3=34.5', x4=46', etc. Do not hook the MFH-259C to the RG59 jumper. Make sure there is 50 Ohm coax between your analyzer and the 75 Ohm jumper.
After doing all of the above, I'd take my readings of the SWR at ch40 & ch1 and start bending the the loop wire back at one end a little at a time until the SWR lands at its best reading.
As some have said, given your installatiion peculiarities the best SWR may not be as low as you desire, but should be low enough to give you good radioing.
Note: If you are using coax other than RG58, google the velocity factor and multiply 17.2' times the VL of your coax.
