Howdy, Toy

Best all around antenna is a center fed doublet fed with balanced TL such as
transmitting twin lead, ladder line, or open wire line.

Make sure that the sending end of this TL "sees" balanced source.

Mine is 130 ft long fed with 300-Ohm transmitting twin lead. I use it on all
bands 80 thru 10. I have also used it on 6M with my tuner straining to get a
match.

On 40 the theoretical gain over a dipole is said to be 1.8 dB.

If you can only have one antenna, this is your best bet.

73 es gud luck, Jack K9CUN