Multiband antennas

Quite a good multi-band antenna is the end-fed via a 9:1 balun. At the end of the wire it presents a high impedance and the 9:1 balun drops the impedance to a low SWR, certainly less than 3:1 that can be tuned via the auto-ATU in many modern rigs. On many radios an ATU will not be needed at all. With QRP, RF on the coax is not usually an issue. With high power, more care or a counterpoise may be needed.

At the moment I am using an end-fed antenna. I have not found a counterpoise necessary.

Commercial versions are available (e.g. from Moonraker), although many make their own.

End fed 10/20/40m antenna re-erected

After being down for all the summer, I have re-erected my 10/20/40m end fed antenna. It broke earlier in the year and I thought some ladder work was needed. I am wobbly on ladders these days. Luckily I could reach the parts that mattered without a ladder and it is now strung to a different tree in the back garden. Getting the wire over the tree was surprisingly hard for me. Years ago this would have been trivial, but not any more.

Although I get a good match on 10m there is a high VSWR on 20m and 40m even with the tuner. At least I am able to WSPR and FT8 again on 10m. Most of the far end (after the 10m choke) is in the tree. To get a decent match on 20m and 40m , I need to choose another end point. It is probably fine on RX on 20m and 40m.